* error.c (errno_missing): add rdoc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8155 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

error.c

@@ -992,7 +992,6 @@ syserr_errno(self)
  * if the error numbers _self_ and _other_ are the same.
  */
 
-
 static VALUE
 syserr_eqq(self, exc)
     VALUE self, exc;
@@ -1017,6 +1016,12 @@ syserr_eqq(self, exc)
     return Qfalse;
 }
 
+/*
+ * call-seq:
+ *   Errno.const_missing   => SystemCallError
+ *
+ * Returns default SystemCallError class.
+ */
 static VALUE
 errno_missing(self, id)
     VALUE self, id;