gh-128949: fix BytesHeaderParser NEWS reference

Link the documented class rather than its inherited parse method. The author reviewed and approved this one-line correction. AI-assisted: Codex.

Author: sankalpsthakur

Misc/NEWS.d/next/Library/2026-09-18-03-00-00.gh-issue-128949.Kb7Nq2.rst

@@ -1,4 +1,4 @@
 Preserve line endings in :meth:`email.parser.BytesParser.parse` and
-:meth:`~email.parser.BytesHeaderParser.parse`. This prevents corruption of
+:class:`~email.parser.BytesHeaderParser`. This prevents corruption of
 unencoded binary payloads and makes parsing a binary file consistent with
 parsing the same content using ``parsebytes()``.