gh-106318: Add doctest role and 'See also' for str.removesuffix()

Author: adorilson

Doc/library/stdtypes.rst

@@ -2387,7 +2387,9 @@ expression support in the :mod:`re` module).
 
    If the string ends with the *suffix* string and that *suffix* is not empty,
    return ``string[:-len(suffix)]``. Otherwise, return a copy of the
-   original string::
+   original string:
+
+   .. doctest::
 
       >>> 'MiscTests'.removesuffix('Tests')
       'Misc'
@@ -2396,6 +2398,8 @@ expression support in the :mod:`re` module).
 
    .. versionadded:: 3.9
 
+   See also :meth:`removeprefix` and :meth:`endswith`.
+
 
 .. method:: str.replace(old, new, /, count=-1)