Fix Garrett Gu name misspelling in 3.14 whatsnew (GH-129822)

Update 3.14.rst to fix typo

Author: garrettgu10

Doc/whatsnew/3.14.rst

@@ -238,7 +238,7 @@ For further information on how to build Python, see
    __ https://en.wikipedia.org/wiki/Tail_call
 
 (Contributed by Ken Jin in :gh:`128718`, with ideas on how to implement this
-in CPython by Mark Shannon, Garret Gu, Haoran Xu, and Josh Haberman.)
+in CPython by Mark Shannon, Garrett Gu, Haoran Xu, and Josh Haberman.)
 
 
 Other language changes