Adjust builtins.zip() docstring to better communicate its signature (GH-14833)

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 65110d8..7f187ea 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -2655,7 +2655,7 @@
 };
 
 PyDoc_STRVAR(zip_doc,
-"zip(iter1 [,iter2 [...]]) --> zip object\n\
+"zip(*iterables) --> zip object\n\
 \n\
 Return a zip object whose .__next__() method returns a tuple where\n\
 the i-th element comes from the i-th iterable argument.  The .__next__()\n\