Fix broken Sphinx references in Doc/c-api/

Author: Aniketsy

Doc/c-api/init_config.rst

@@ -1984,7 +1984,7 @@ PyConfig
 
       The :mod:`warnings` module adds :data:`sys.warnoptions` in the reverse
       order: the last :c:member:`PyConfig.warnoptions` item becomes the first
-      item of :attr:`warnings.filters` which is checked first (highest priority).
+      item of ``warnings.filters`` which is checked first (highest priority).
 
       The :option:`-W` command line options adds its value to
       :c:member:`~PyConfig.warnoptions`, it can be used multiple times.

Doc/tools/.nitignore

@@ -2,8 +2,6 @@
 # as tested on the CI via check-warnings.py in reusable-docs.yml.
 # Keep lines sorted lexicographically to help avoid merge conflicts.
 
-Doc/c-api/init_config.rst
-Doc/c-api/stable.rst
 Doc/library/ast.rst
 Doc/library/asyncio-extending.rst
 Doc/library/email.charset.rst