bpo-33556: Remove reference to thread module from docstring (GH-6963)

Lib/threading.py

@@ -1069,7 +1069,7 @@ class Thread:
     def ident(self):
         """Thread identifier of this thread or None if it has not been started.
 
-        This is a nonzero integer. See the thread.get_ident() function. Thread
+        This is a nonzero integer. See the get_ident() function. Thread
         identifiers may be recycled when a thread exits and another thread is
         created. The identifier is available even after the thread has exited.