[3.12] pythongh-101100: Docs: Check Sphinx warnings and fail if improved (pythonGH-106460).

(cherry picked from commit 806d7c9)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Author: CAM-Gerlach

Doc/tools/.nitignore

@@ -9,7 +9,6 @@ Doc/c-api/exceptions.rst
 Doc/c-api/file.rst
 Doc/c-api/float.rst
 Doc/c-api/gcsupport.rst
-Doc/c-api/import.rst
 Doc/c-api/init.rst
 Doc/c-api/init_config.rst
 Doc/c-api/intro.rst
@@ -55,6 +54,7 @@ Doc/library/bisect.rst
 Doc/library/bz2.rst
 Doc/library/calendar.rst
 Doc/library/cgi.rst
+Doc/library/chunk.rst
 Doc/library/cmd.rst
 Doc/library/codecs.rst
 Doc/library/collections.abc.rst
@@ -85,6 +85,7 @@ Doc/library/fcntl.rst
 Doc/library/ftplib.rst
 Doc/library/functions.rst
 Doc/library/functools.rst
+Doc/library/getopt.rst
 Doc/library/getpass.rst
 Doc/library/gettext.rst
 Doc/library/gzip.rst