gh-102259: Fix re doc issue regarding right square brackets (GH-102264)

(cherry picked from commit bcadcde)

Co-authored-by: Skip Montanaro <[email protected]>
Co-authored-by: Terry Jan Reedy <[email protected]>

Author: 3 people

Doc/library/re.rst

@@ -232,7 +232,8 @@ The special characters are:
 
    * To match a literal ``']'`` inside a set, precede it with a backslash, or
      place it at the beginning of the set.  For example, both ``[()[\]{}]`` and
-     ``[]()[{}]`` will both match a parenthesis.
+     ``[]()[{}]`` will match a right bracket, as well as left bracket, braces,
+     and parentheses.
 
    .. .. index:: single: --; in regular expressions
    .. .. index:: single: &&; in regular expressions