gh-95913: Fix grammar for SpooledTemporaryFile 3.11 whatsnew entry (GH-98604)

Followup from GH-98312.
(cherry picked from commit c5a9d3f)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: miss-islington

Doc/whatsnew/3.11.rst

@@ -1000,7 +1000,7 @@ sysconfig
 tempfile
 --------
 
-* :class:`~tempfile.SpooledTemporaryFile` objects now fully implements the methods
+* :class:`~tempfile.SpooledTemporaryFile` objects now fully implement the methods
   of :class:`io.BufferedIOBase` or :class:`io.TextIOBase`
   (depending on file mode).
   This lets them work correctly with APIs that expect file-like objects,