Update fiddle entries under the doc directory

Merged: https://github.com/ruby/ruby/pull/12616

doc/maintainers.md

@@ -339,12 +339,6 @@ have commit right, others don't.
 * https://github.com/ruby/fcntl
 * https://rubygems.org/gems/fcntl
 
-#### ext/fiddle
-
-* Aaron Patterson ([tenderlove])
-* https://github.com/ruby/fiddle
-* https://rubygems.org/gems/fiddle
-
 #### ext/io/console
 
 * Nobuyuki Nakada ([nobu])
@@ -558,6 +552,10 @@ have commit right, others don't.
 
 * https://github.com/ruby/readline
 
+#### fiddle
+
+* https://github.com/ruby/fiddle
+
 ## Platform Maintainers
 
 ### mswin64 (Microsoft Windows)

doc/standard_library.md

@@ -71,7 +71,6 @@ of each.
 - Digest ([GitHub][digest]): Provides a framework for message digest libraries
 - Etc ([GitHub][etc]): Provides access to information typically stored in the UNIX /etc directory
 - Fcntl ([GitHub][fcntl]): Loads constants defined in the OS fcntl.h C header file
-- Fiddle ([GitHub][fiddle]): A libffi wrapper for Ruby
 - IO.console ([GitHub][io-console]): Extensions for the IO class, including `IO.console`, `IO.winsize`, etc.
 - JSON ([GitHub][json]): Implements JavaScript Object Notation for Ruby
 - OpenSSL ([GitHub][openssl]): Provides SSL, TLS, and general-purpose cryptography for Ruby
@@ -126,6 +125,7 @@ of each.
 - [win32ole]: Provides an interface for OLE Automation in Ruby
 - [reline]: GNU Readline and Editline in a pure Ruby implementation
 - [readline]: Wrapper for the Readline extension and Reline
+- [fiddle]: A libffi wrapper for Ruby
 
 ## Tools