Fix grammar of get param in set command
@@ -1146,7 +1146,7 @@ class Commands:
(Available since Redis 6.0)
``get`` if True, set the value at key ``name`` to ``value`` and return
- the old value stored at key, or None when key did not exist.
+ the old value stored at key, or None if the key did not exist.
(Available since Redis 6.2)
``exat`` sets an expire flag on key ``name`` for ``ex`` seconds,
