gh-70765: Remove unnecessary extra backtick from Changelog entry (GH-140071)

(cherry picked from commit f70082b)

Co-authored-by: Rafael Fontenelle <[email protected]>

Author: rffontenelle

Misc/NEWS.d/next/Library/2025-10-02-17-40-10.gh-issue-70765.zVlLZn.rst

@@ -1,5 +1,5 @@
 :mod:`http.server`: fix default handling of HTTP/0.9 requests in
 :class:`~http.server.BaseHTTPRequestHandler`. Previously,
-:meth:`!BaseHTTPRequestHandler.parse_request`` incorrectly
+:meth:`!BaseHTTPRequestHandler.parse_request` incorrectly
 waited for headers in the request although those are not
 supported in HTTP/0.9. Patch by Bénédikt Tran.