Change docs

Author: rruuaanng

Doc/library/threading.rst

@@ -367,7 +367,7 @@ since it is impossible to detect the termination of alien threads.
 
       Threads are non-daemon by default, meaning they block the program from
       exiting until they complete. By setting *daemon*=True, thread becomes
-      daemon and will be forcibly terminated when the main program exits. use
+      daemon and will be forcibly terminated when the main program exits. Use
       an explicit call to ``.join()`` on the daemon thread, which will block
       the main program until the thread completes.