readline or libedit is no longer required to build ruby

doc/contributing/building_ruby.md

@@ -23,7 +23,6 @@
 
 2. Install optional, recommended dependencies:
 
-    * readline/editline (libedit, to build readline)
     * libffi (to build fiddle)
     * gmp (if you with to accelerate Bignum operations)
     * libexecinfo (FreeBSD)

doc/windows.md

@@ -19,7 +19,7 @@ Ruby core development can be done either in Windows `cmd` like:
 ```
 ridk enable ucrt64
 
-pacman -S --needed bison %MINGW_PACKAGE_PREFIX%-openssl %MINGW_PACKAGE_PREFIX%-libyaml %MINGW_PACKAGE_PREFIX%-readline
+pacman -S --needed bison %MINGW_PACKAGE_PREFIX%-openssl %MINGW_PACKAGE_PREFIX%-libyaml
 
 cd c:\
 mkdir work
@@ -38,7 +38,7 @@ or in MSYS2 `bash` like:
 ridk enable ucrt64
 bash
 
-pacman -S --needed bison $MINGW_PACKAGE_PREFIX-openssl $MINGW_PACKAGE_PREFIX-libyaml $MINGW_PACKAGE_PREFIX-readline
+pacman -S --needed bison $MINGW_PACKAGE_PREFIX-openssl $MINGW_PACKAGE_PREFIX-libyaml
 
 cd /c/
 mkdir work

doc/yjit/yjit.md

@@ -104,7 +104,7 @@ On macOS, you may need to specify where to find some libraries:
 
 ```sh
 # Install dependencies
-brew install openssl readline libyaml
+brew install openssl libyaml
 
 # Configure in dev (debug) mode for development, build and install
 ./autogen.sh