pythongh-106318: Add examples for str.istitle() (pythonGH-140046)

(cherry picked from commit 07e617e)

Co-authored-by: Adorilson Bezerra <[email protected]>

Author: adorilson

Doc/library/stdtypes.rst

@@ -2021,6 +2021,19 @@ expression support in the :mod:`re` module).
    character, for example uppercase characters may only follow uncased characters
    and lowercase characters only cased ones.  Return ``False`` otherwise.
 
+   For example:
+
+   .. doctest::
+
+      >>> 'Spam, Spam, Spam'.istitle()
+      True
+      >>> 'spam, spam, spam'.istitle()
+      False
+      >>> 'SPAM, SPAM, SPAM'.istitle()
+      False
+
+   See also :meth:`title`.
+
 
 .. method:: str.isupper()
 
@@ -2398,6 +2411,8 @@ expression support in the :mod:`re` module).
         >>> titlecase("they're bill's friends.")
         "They're Bill's Friends."
 
+   See also :meth:`istitle`.
+
 
 .. method:: str.translate(table, /)