Update Doc/whatsnew/3.13.rst

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

Author: marcelm

Doc/whatsnew/3.15.rst

@@ -844,7 +844,7 @@ inspect
 io
 --
 
-* Add :meth:`~io.BytesIO.peek`.
+* Add :meth:`io.BytesIO.peek`.
   (Contributed by Marcel Martin in :gh:`90533`.)