Issue #23921: Standardized documentation whitespace formatting.
Original patch by James Edwards.
diff --git a/Doc/library/asyncio-sync.rst b/Doc/library/asyncio-sync.rst
index ad3b523..1d299ec6 100644
--- a/Doc/library/asyncio-sync.rst
+++ b/Doc/library/asyncio-sync.rst
@@ -71,14 +71,14 @@
        lock = Lock()
        ...
        with (yield from lock):
-            ...
+           ...
 
    Lock objects can be tested for locking state::
 
        if not lock.locked():
-          yield from lock
+           yield from lock
        else:
-          # lock is acquired
+           # lock is acquired
            ...
 
    .. method:: locked()