bpo-30951: Correct co_names docstring in inspect module (GH-2743) (GH-28543)

(cherry picked from commit 3f8b23f8ddab75d9b77a3997d54e663187e12cc8)

Co-authored-by: Alex Vig <jalexvig@gmail.com>
diff --git a/Lib/inspect.py b/Lib/inspect.py
index 7aedcf1..2374e59 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -395,7 +395,7 @@ def iscode(object):
         co_kwonlyargcount   number of keyword only arguments (not including ** arg)
         co_lnotab           encoded mapping of line numbers to bytecode indices
         co_name             name with which this code object was defined
-        co_names            tuple of names of local variables
+        co_names            tuple of names other than arguments and function locals
         co_nlocals          number of local variables
         co_stacksize        virtual machine stack space required
         co_varnames         tuple of names of arguments and local variables"""