[3.15] gh-106318: Add link to str.capitalize on the str.title() docs (GH-144578) (#161328)

gh-106318: Add link to str.capitalize on the str.title() docs (GH-144578)
(cherry picked from commit e6dda5f)

Co-authored-by: Adorilson Bezerra <adorilson@gmail.com>

Author: miss-islington

Doc/builtins/stdtypes.rst

@@ -3147,7 +3147,7 @@ expression support in the :mod:`re` module).
         >>> titlecase("they're bill's friends.")
         "They're Bill's Friends."
 
-   See also :meth:`istitle`.
+   See also :meth:`istitle` and :meth:`capitalize`.
 
 
 .. method:: str.translate(table, /)