[3.12] Docs: Add link to skip to datetime's format codes (GH-108027) (#108329)

Docs: Add link to skip to datetime's format codes (GH-108027)
(cherry picked from commit 35cb160)

Co-authored-by: Hugo van Kemenade <[email protected]>

Author: miss-islington

Doc/library/datetime.rst

@@ -19,6 +19,10 @@ The :mod:`datetime` module supplies classes for manipulating dates and times.
 While date and time arithmetic is supported, the focus of the implementation is
 on efficient attribute extraction for output formatting and manipulation.
 
+.. tip::
+
+    Skip to :ref:`the format codes <format-codes>`.
+
 .. seealso::
 
    Module :mod:`calendar`
@@ -2322,6 +2326,8 @@ versus :meth:`strptime`:
 +----------------+--------------------------------------------------------+------------------------------------------------------------------------------+
 
 
+   .. _format-codes:
+
 :meth:`strftime` and :meth:`strptime` Format Codes
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^