[3.14] gh-101100: Resolve reference warnings in library/xml.sax.handler.rst (GH-136612) (#138421)

gh-101100: Resolve reference warnings in library/xml.sax.handler.rst (GH-136612)
(cherry picked from commit c22cc8fccdd299fa923f04e253a3f7c59ce88bfe)

Co-authored-by: Weilin Du <108666168+LamentXU123@users.noreply.github.com>