Issue 10789: Correct threading.Lock.acquire signature.
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
index cd3f963..142f1ec 100644
--- a/Doc/library/threading.rst
+++ b/Doc/library/threading.rst
@@ -388,7 +388,7 @@
 All methods are executed atomically.
 
 
-.. method:: Lock.acquire([blocking=1])
+.. method:: Lock.acquire([blocking])
 
    Acquire a lock, blocking or non-blocking.