Rephrase !PyErr_Occurred() comment: may=>can

Issue #29259.
diff --git a/Objects/methodobject.c b/Objects/methodobject.c
index 5331cfb..ebea8b3 100644
--- a/Objects/methodobject.c
+++ b/Objects/methodobject.c
@@ -95,7 +95,7 @@
     int flags;
 
     /* _PyMethodDef_RawFastCallDict() must not be called with an exception set,
-       because it may clear it (directly or indirectly) and so the
+       because it can clear it (directly or indirectly) and so the
        caller loses its exception */
     assert(!PyErr_Occurred());