[DOC] Use RDoc link style for links to other classes/modules

I used this regex:

([A-Za-z]+)\.html#(?:class|module)-[A-Za-z]+-label-([A-Za-z0-9\-\+]+)

And performed a global find & replace for this:

rdoc-ref:$1@$2

array.c

@@ -8080,8 +8080,8 @@ rb_ary_deconstruct(VALUE ary)
  *
  *  First, what's elsewhere. \Class \Array:
  *
- *  - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
- *  - Includes {module Enumerable}[Enumerable.html#module-Enumerable-label-What-27s+Here],
+ *  - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+ *  - Includes {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here],
  *    which provides dozens of additional methods.
  *
  *  Here, class \Array provides methods that are useful for:

file.c

@@ -6577,9 +6577,9 @@ const char ruby_null_device[] =
  *
  *  First, what's elsewhere. \Class \File:
  *
- *  - Inherits from {class IO}[IO.html#class-IO-label-What-27s+Here],
+ *  - Inherits from {class IO}[rdoc-ref:IO@What-27s+Here],
  *    in particular, methods for creating, reading, and writing files
- *  - Includes {module FileTest}[FileTest.html#module-FileTest-label-What-27s+Here].
+ *  - Includes {module FileTest}[rdoc-ref:FileTest@What-27s+Here].
  *    which provides dozens of additional methods.
  *
  *  Here, class \File provides methods that are useful for:

hash.c

@@ -7014,8 +7014,8 @@ static const rb_data_type_t env_data_type = {
  *
  *  First, what's elsewhere. \Class \Hash:
  *
- *  - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
- *  - Includes {module Enumerable}[Enumerable.html#module-Enumerable-label-What-27s+Here],
+ *  - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+ *  - Includes {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here],
  *    which provides dozens of additional methods.
  *
  *  Here, class \Hash provides methods that are useful for:
@@ -7327,8 +7327,8 @@ Init_Hash(void)
      *
      * First, what's elsewhere. \Class \ENV:
      *
-     * - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
-     * - Extends {module Enumerable}[Enumerable.html#module-Enumerable-label-What-27s+Here],
+     * - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+     * - Extends {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here],
      *
      * Here, class \ENV provides methods that are useful for:
      *

io.c

@@ -9715,12 +9715,12 @@ static VALUE argf_readlines(int, VALUE *, VALUE);
  *
  *  Returns an array containing the lines returned by calling
  *  Kernel#gets until the end-of-file is reached;
- *  (see {Lines}[IO.html#class-IO-label-Lines]).
+ *  (see {Lines}[rdoc-ref:IO@Lines]).
  *
  *  With only string argument +sep+ given,
  *  returns the remaining lines as determined by line separator +sep+,
  *  or +nil+ if none;
- *  see {Line Separator}[IO.html#class-IO-label-Line+Separator].\:
+ *  see {Line Separator}[rdoc-ref:IO@Line+Separator].\:
  *
  *    # Default separator.
  *    $ cat t.txt | ruby -e "p readlines"
@@ -9740,7 +9740,7 @@ static VALUE argf_readlines(int, VALUE *, VALUE);
  *
  *  With only integer argument +limit+ given,
  *  limits the number of bytes in the line;
- *  see {Line Limit}}[IO.html#class-IO-label-Line+Limit]:
+ *  see {Line Limit}}[rdoc-ref:IO@Line+Limit]:
  *
  *    $cat t.txt | ruby -e "p readlines 10"
  *    ["First line", "\n", "Second lin", "e\n", "\n", "Fourth lin", "e\n", "Fifth line", "\n"]
@@ -9752,10 +9752,10 @@ static VALUE argf_readlines(int, VALUE *, VALUE);
  *    ["First line\n", "Second line\n", "\n", "Fourth line\n", "Fifth line\n"]
  *
  *  With arguments +sep+ and +limit+ given, combines the two behaviors;
- *  see {Line Separator and Line Limit}[IO.html#class-IO-label-Line+Separator+and+Line+Limit].
+ *  see {Line Separator and Line Limit}[rdoc-ref:IO@Line+Separator+and+Line+Limit].
  *
  *  For all forms above, trailing optional keyword arguments may be given;
- *  see {Line Options}[IO.html#class-IO-label-Line+Options]:
+ *  see {Line Options}[rdoc-ref:IO@Line+Options]:
  *
  *    $ cat t.txt | ruby -e "p readlines(chomp: true)"
  *    ["First line", "Second line", "", "Fourth line", "Fifth line"]
@@ -14376,8 +14376,8 @@ set_LAST_READ_LINE(VALUE val, ID _x, VALUE *_y)
  *
  *  First, what's elsewhere. \Class \IO:
  *
- *  - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
- *  - Includes {module Enumerable}[Enumerable.html#module-Enumerable-label-What-27s+Here],
+ *  - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+ *  - Includes {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here],
  *    which provides dozens of additional methods.
  *
  *  Here, class \IO provides methods that are useful for:

numeric.c

@@ -958,7 +958,7 @@ num_negative_p(VALUE num)
  *
  *  First, what's elsewhere. \Class \Float:
  *
- *  - Inherits from {class Numeric}[Numeric.html#class-Numeric-label-What-27s+Here].
+ *  - Inherits from {class Numeric}[rdoc-ref:Numeric@What-27s+Here].
  *
  *  Here, class \Float provides methods for:
  *
@@ -3495,7 +3495,7 @@ rb_num2ull(VALUE val)
  *
  * First, what's elsewhere. \Class \Integer:
  *
- * - Inherits from {class Numeric}[Numeric.html#class-Numeric-label-What-27s+Here].
+ * - Inherits from {class Numeric}[rdoc-ref:Numeric@What-27s+Here].
  *
  * Here, class \Integer provides methods for:
  *
@@ -6099,8 +6099,8 @@ int_s_try_convert(VALUE self, VALUE num)
  *
  * First, what's elsewhere. \Class \Numeric:
  *
- * - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
- * - Includes {module Comparable}[Comparable.html#module-Comparable-label-What-27s+Here].
+ * - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+ * - Includes {module Comparable}[rdoc-ref:Comparable@What-27s+Here].
  *
  * Here, class \Numeric provides methods for:
  *

object.c

@@ -4162,8 +4162,8 @@ f_sprintf(int c, const VALUE *v, VALUE _)
  *
  *  First, what's elsewhere. \Class \Object:
  *
- *  - Inherits from {class BasicObject}[BasicObject.html#class-BasicObject-label-What-27s+Here].
- *  - Includes {module Kernel}[Kernel.html#module-Kernel-label-What-27s+Here].
+ *  - Inherits from {class BasicObject}[rdoc-ref:BasicObject@What-27s+Here].
+ *  - Includes {module Kernel}[rdoc-ref:Kernel@What-27s+Here].
  *
  *  Here, class \Object provides methods for:
  *

range.c

@@ -2207,8 +2207,8 @@ range_count(int argc, VALUE *argv, VALUE range)
  *
  * First, what's elsewhere. \Class \Range:
  *
- * - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
- * - Includes {module Enumerable}[Enumerable.html#module-Enumerable-label-What-27s+Here],
+ * - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+ * - Includes {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here],
  *   which provides dozens of additional methods.
  *
  * Here, class \Range provides methods that are useful for:

string.c

@@ -11291,8 +11291,8 @@ rb_str_unicode_normalized_p(int argc, VALUE *argv, VALUE str)
  *
  * First, what's elsewhere. \Class \Symbol:
  *
- * - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
- * - Includes {module Comparable}[Comparable.html#module-Comparable-label-What-27s+Here].
+ * - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+ * - Includes {module Comparable}[rdoc-ref:Comparable@What-27s+Here].
  *
  * Here, class \Symbol provides methods that are useful for:
  *
@@ -12095,8 +12095,8 @@ rb_enc_interned_str_cstr(const char *ptr, rb_encoding *enc)
  *
  *  First, what's elsewhere. \Class \String:
  *
- *  - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
- *  - Includes {module Comparable}[Comparable.html#module-Comparable-label-What-27s+Here].
+ *  - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+ *  - Includes {module Comparable}[rdoc-ref:Comparable@What-27s+Here].
  *
  *  Here, class \String provides methods that are useful for:
  *

struct.c

@@ -1562,8 +1562,8 @@ rb_struct_dig(int argc, VALUE *argv, VALUE self)
  *
  *  First, what's elsewhere. \Class \Struct:
  *
- *  - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
- *  - Includes {module Enumerable}[Enumerable.html#module-Enumerable-label-What-27s+Here],
+ *  - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
+ *  - Includes {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here],
  *    which provides dozens of additional methods.
  *
  *  Here, class \Struct provides methods that are useful for: