Use Sphinx references

Co-authored-by: Peter Bierma <[email protected]>

Author: sethmlarson

Misc/NEWS.d/next/Security/2025-01-28-14-08-03.gh-issue-105704.EnhHxu.rst

@@ -1,4 +1,4 @@
-When using ``urllib.parse.urlsplit()`` and ``urlparse()`` host parsing would
+When using :func:`urllib.parse.urlsplit()` and :func:`urllib.parse.urlparse()` host parsing would
 not reject domain names containing square brackets (``[`` and ``]``). Square
 brackets are only valid for IPv6 and IPvFuture hosts according to `RFC 3986
 Section 3.2.2 <https://www.rfc-editor.org/rfc/rfc3986#section-3.2.2>`__.