importlib.metadata: Remove empty footnote section (GH-30451)

(cherry picked from commit 13331a1)

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

Author: miss-islington

Diff for: Doc/library/importlib.metadata.rst

@@ -335,6 +335,3 @@ a custom finder, return instances of this derived ``Distribution`` in the
 .. _`entry point API`: https://setuptools.readthedocs.io/en/latest/pkg_resources.html#entry-points
 .. _`metadata API`: https://setuptools.readthedocs.io/en/latest/pkg_resources.html#metadata-api
 .. _`importlib_resources`: https://importlib-resources.readthedocs.io/en/latest/index.html
-
-
-.. rubric:: Footnotes