Update docs/html/user_guide.rst

Co-authored-by: Pradyun Gedam <[email protected]>

docs/html/user_guide.rst

@@ -1152,7 +1152,7 @@ announcements on the `low-traffic packaging announcements list`_ and
 .. _Python Windows launcher: https://docs.python.org/3/using/windows.html#launcher
 
 Using system trust stores for verifying HTTPS
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+=============================================
 
 pip 22.2 added **experimental** support for using system trust stores to verify HTTPS certificates
 instead of certifi. Using system trust stores has advantages over certifi like automatically supporting