https://git.ruby-lang.org/ruby.git/commit/?id=4b248e7994

From 4b248e7994e68fa5075f62d4cbfb36514ffd7bfa Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 3 Nov 2021 03:52:28 +0900
Subject: string.c: Follow up to ae2359f602bb467ca755eef02d73d361d35eaed7

* Mention `\0`
* Make the example of hash replacement meaningful
---
 string.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/string.c b/string.c
index aa26f35d60a..154f8e98d9d 100644
--- a/string.c
+++ b/string.c
@@ -11859,7 +11859,7 @@ rb_enc_interned_str_cstr(const char *ptr, rb_encoding *enc) https://github.com/ruby/ruby/blob/trunk/string.c#L11859
  *  However, you may refer to some special match variables using these
  *  combinations:
  *
- *  - <tt>\&</tt> corresponds to <tt>$&</tt>,
+ *  - <tt>\&</tt> and <tt>\0</tt> correspond to <tt>$&</tt>,
  *    which contains the complete matched text.
  *  - <tt>\'</tt> corresponds to <tt>$'</tt>,
  *    which contains string after match.
@@ -11894,11 +11894,12 @@ rb_enc_interned_str_cstr(const char *ptr, rb_encoding *enc) https://github.com/ruby/ruby/blob/trunk/string.c#L11894
  *  the replacing string is the value for that key:
  *
  *    h = {'foo' => 'bar', 'baz' => 'bat'}
- *    'food'.sub('oo', h) # => "fd"
+ *    'food'.sub('foo', h) # => "bard"
+ *
+ *  Note that a symbol key does not match:
+ *
  *    h = {foo: 'bar', baz: 'bat'}
- *    'food'.sub('oo', h) # => "fd"
- *    h = {foo: :bar, baz: :bat}
- *    'food'.sub('oo', h) # => "fd"
+ *    'food'.sub('foo', h) # => "d"
  *
  *  <b>Block</b>
  *
-- 
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