Use console code highlighting where appropriate

… which handles the prefix `$` correctly.

README.ja.md

@@ -40,11 +40,15 @@ https://www.ruby-lang.org/ja/downloads/
 
 ミラーをGitHubに公開しています． 以下のコマンドでリポジトリを取得できます．
 
-    $ git clone https://github.com/ruby/ruby.git
+```console
+$ git clone https://github.com/ruby/ruby.git
+```
 
 他のブランチの一覧は次のコマンドで見られます．
 
-    $ git ls-remote https://github.com/ruby/ruby.git
+```console
+$ git ls-remote https://github.com/ruby/ruby.git
+```
 
 Rubyリポジトリの本来のmasterは https://git.ruby-lang.org/ruby.git にあります．
 コミッタはこちらを使います．

doc/NEWS/NEWS-3.0.0.md

@@ -741,7 +741,7 @@ end
 foo(42)
 ```
 
-```
+```console
 $ typeprof test.rb
 # Classes
 class Object

doc/NEWS/NEWS-3.1.0.md

@@ -552,7 +552,7 @@ Example: `title = json[:article][:title]`
 
 If `json` is nil, it shows:
 
-```
+```console
 $ ruby test.rb
 test.rb:2:in `<main>': undefined method `[]' for nil:NilClass (NoMethodError)
 
@@ -562,7 +562,7 @@ title = json[:article][:title]
 
 If `json[:article]` returns nil, it shows:
 
-```
+```console
 $ ruby test.rb
 test.rb:2:in `<main>': undefined method `[]' for nil:NilClass (NoMethodError)
 

doc/NEWS/NEWS-3.2.0.md

@@ -623,13 +623,13 @@ The following deprecated methods are removed.
     Psych and fiddle supported the static build with specific version of libyaml
     and libffi sources. You can build psych with libyaml-0.2.5 like this.
 
-    ```bash
+    ```console
     $ ./configure --with-libyaml-source-dir=/path/to/libyaml-0.2.5
     ```
 
     And you can build fiddle with libffi-3.4.4 like this.
 
-    ```bash
+    ```console
     $ ./configure --with-libffi-source-dir=/path/to/libffi-3.4.4
     ```
 

doc/command_line/environment.md

@@ -8,7 +8,7 @@ of the invoked Ruby program.
 The examples here use command-line option `-e`,
 which passes the Ruby code to be executed on the command line itself:
 
-```sh
+```console
 $ ruby -e 'puts "Hello, World."'
 ```
 
@@ -18,7 +18,7 @@ The argument to option `-C` specifies a working directory
 for the invoked Ruby program;
 does not change the working directory for the current process:
 
-```sh
+```console
 $ basename `pwd`
 ruby
 $ ruby -C lib -e 'puts File.basename(Dir.pwd)'
@@ -35,7 +35,7 @@ The argument to option `-I` specifies a directory
 to be added to the array in global variable `$LOAD_PATH`;
 the option may be given more than once:
 
-```sh
+```console
 $ pushd /tmp
 $ ruby -e 'p $LOAD_PATH.size'
 8
@@ -54,7 +54,7 @@ The argument to option `-r` specifies a library to be required
 before executing the Ruby program;
 the option may be given more than once:
 
-```sh
+```console
 $ ruby -e 'p defined?(JSON); p defined?(CSV)'
 nil
 nil
@@ -83,10 +83,10 @@ these digits are prefixed with digit `0` to form an octal value:
 
 Examples:
 
-```sh
+```console
 $ ruby -0 -e 'p $/'
 "\x00"
-ruby -00 -e 'p $/'
+$ ruby -00 -e 'p $/'
 ""
 $ ruby -012 -e 'p $/'
 "\n"
@@ -109,7 +109,7 @@ these commonly write to `$stdout` or `$stderr`.
 The default value for `$DEBUG` is `false`;
 option `-d` (or `--debug`) sets it to `true`:
 
-```sh
+```console
 $ ruby -e 'p $DEBUG'
 false
 $ ruby -d -e 'p $DEBUG'
@@ -140,7 +140,7 @@ by setting the initial value of global variable `$-W`:
 The value of `$-W`, in turn, determines which warning messages (if any)
 are to be printed to `$stdout` (see Kernel#warn):
 
-```sh
+```console
 $ ruby -W1 -e 'p $foo'
 nil
 $ ruby -W2 -e 'p $foo'
@@ -166,7 +166,7 @@ Warning[:performance]  = true
 
 You can suppress a category by prefixing `no-` to the category name:
 
-```
+```console
 $ ruby -W:no-experimental -e 'p IO::Buffer.new'
 #<IO::Buffer>
 ```

doc/distribution.md

@@ -19,7 +19,8 @@ See the Snapshots section of the [Ruby website](https://www.ruby-lang.org/en/dow
 This can be useful if the nightly tarball does not have all changes yet.
 
 At Ruby source tree cloned using git:
-```sh-session
+
+```console
 $ ./autogen.sh
 $ ./configure -C
 $ make

doc/exceptions.md

@@ -24,7 +24,7 @@ If an exception not _rescued_
 execution transfers to code in the Ruby interpreter
 that prints a message and exits the program (or thread):
 
-```
+```console
 $ ruby -e "raise"
 -e:1:in `<main>': unhandled exception
 ```

doc/ruby/option_dump.md

@@ -5,7 +5,7 @@ see {Option --dump}[options_md.html#label--dump-3A+Dump+Items].
 
 For the examples here, we use this program:
 
-```sh
+```console
 $ cat t.rb
 puts 'Foo'
 ```
@@ -26,7 +26,7 @@ The supported dump items:
 - `parsetree`: {Abstract syntax tree}[https://en.wikipedia.org/wiki/Abstract_syntax_tree]
   (AST):
 
-    ```sh
+    ```console
     $ ruby --dump=parsetree t.rb
     ###########################################################
     ## Do NOT use this node dump for any purpose other than  ##
@@ -52,7 +52,7 @@ The supported dump items:
 
 - `parsetree_with_comment`: AST with comments:
 
-    ```sh
+    ```console
     $ ruby --dump=parsetree_with_comment t.rb
     ###########################################################
     ## Do NOT use this node dump for any purpose other than  ##