[3.15] Fix typos in Py_tp_base macro documentation (GH-154150) (#154180)

(cherry picked from commit 53916ee)

Co-authored-by: Michael Newman <michael.b.newman@gmail.com>

Author: miss-islington

Doc/c-api/type.rst

@@ -699,7 +699,7 @@ but need extra remarks for use as slots:
 
    .. soft-deprecated:: 3.15
 
-      When not targetting older Python versions, pefer :c:macro:`!Py_tp_bases`.
+      When not targeting older Python versions, prefer :c:macro:`!Py_tp_bases`.
 
 The following slots do not correspond to public fields in the
 underlying structures: