Document about abbrev at Ruby 3.4

doc/maintainers.md

@@ -72,10 +72,6 @@ have commit right, others don't.
 
 ## Default gems Maintainers
 ### Libraries
-#### lib/abbrev.rb
-* Akinori MUSHA (knu)
-* https://github.com/ruby/abbrev
-* https://rubygems.org/gems/abbrev
 
 #### lib/benchmark.rb
 * *unmaintained*
@@ -479,6 +475,10 @@ have commit right, others don't.
 #### observer
 * https://github.com/ruby/observer
 
+#### abbrev
+* https://github.com/ruby/abbrev
+
+
 ## Platform Maintainers
 ### mswin64 (Microsoft Windows)
 * NAKAMURA Usaku (usa)

doc/standard_library.rdoc

@@ -33,7 +33,6 @@ Socket:: Access underlying OS socket implementations
 
 == Libraries
 
-Abbrev:: Calculates a set of unique abbreviations for a given set of strings
 Benchmark:: Provides methods to measure and report the time used to execute code
 Bundler:: Manage your Ruby application's gem dependencies
 CGI:: Support for the Common Gateway Interface protocol
@@ -130,3 +129,4 @@ GetoptLong:: Parse command line options similar to the GNU C getopt_long()
 Base64:: Support for encoding and decoding binary data using a Base64 representation
 BigDecimal:: Provides arbitrary-precision floating point decimal arithmetic
 Observable:: Provides a mechanism for publish/subscribe pattern in Ruby
+Abbrev:: Calculates a set of unique abbreviations for a given set of strings