Add missing "to" to two tp_flags notes (GH-31624)

(cherry picked from commit 422fdb3)

Co-authored-by: Brandt Bucher <[email protected]>

Author: miss-islington

Doc/c-api/typeobj.rst

@@ -1232,7 +1232,7 @@ and :c:type:`PyType_Type` effectively act as defaults.)
       .. note::
 
          :const:`Py_TPFLAGS_MAPPING` and :const:`Py_TPFLAGS_SEQUENCE` are
-         mutually exclusive; it is an error enable both flags simultaneously.
+         mutually exclusive; it is an error to enable both flags simultaneously.
 
       **Inheritance:**
 
@@ -1254,7 +1254,7 @@ and :c:type:`PyType_Type` effectively act as defaults.)
       .. note::
 
          :const:`Py_TPFLAGS_MAPPING` and :const:`Py_TPFLAGS_SEQUENCE` are
-         mutually exclusive; it is an error enable both flags simultaneously.
+         mutually exclusive; it is an error to enable both flags simultaneously.
 
       **Inheritance:**