Fix spelling and grammar in documentation and code comments
diff --git a/Lib/threading.py b/Lib/threading.py
index c9f8cb6..06b7b9b 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -639,7 +639,7 @@
             self._break()
             raise
 
-    # Wait in the barrier until we are relased.  Raise an exception
+    # Wait in the barrier until we are released.  Raise an exception
     # if the barrier is reset or broken.
     def _wait(self, timeout):
         if not self._cond.wait_for(lambda : self._state != 0, timeout):