docs: Disambiguate a pair of rST labels

docs: Disambiguate a pair of rST labels

According to the reStructuredText documentation, internal hyperlink
targets[1] are intended to resolve within the current document.

Sphinx has a bug that causes internal hyperlinks declared with
duplicate names to resolve nondeterministically, producing incorrect
documentation. Sphinx does not yet emit a warning when these
duplicate target names are declared.

To improve the reproducibility and correctness of the HTML
documentation, disambiguate two labels both previously titled
"submit_improvements".

[1] - https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#hyperlink-targets

Link: https://github.com/sphinx-doc/sphinx/issues/13383
Signed-off-by: James Addison <jay@jp-hosting.net>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250407195120.331103-2-jvanderwaa@redhat.com