gh-138186: Use 'predicate' instead of 'function' in filterfalse docstring

Change the parameter name in itertools.filterfalse's docstring from
'function' to 'predicate' for consistency with the RST documentation
and with similar functions dropwhile and takewhile.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kovan

Modules/clinic/itertoolsmodule.c.h

@@ -3245,17 +3245,17 @@ typedef struct {
 /*[clinic input]
 @classmethod
 itertools.filterfalse.__new__
-    function as func: object
+    predicate as func: object
     iterable as seq: object
     /
-Return those items of iterable for which function(item) is false.
+Return those items of iterable for which predicate(item) is false.
 
-If function is None, return the items that are false.
+If predicate is None, return the items that are false.
 [clinic start generated code]*/
 
 static PyObject *
 itertools_filterfalse_impl(PyTypeObject *type, PyObject *func, PyObject *seq)
-/*[clinic end generated code: output=55f87eab9fc0484e input=2d684a2c66f99cde]*/
+/*[clinic end generated code: output=55f87eab9fc0484e input=a7df36679f5f66d6]*/
 {
     PyObject *it;
     filterfalseobject *lz;