Merge pull request #4751 from xiang90/doc

doc: fix refresh section in api.md

Documentation/api.md

@@ -233,7 +233,7 @@ curl http://127.0.0.1:2379/v2/keys/foo -XPUT -d value=bar -d ttl= -d prevExist=t
 
 ### Refreshing key TTL
 
-Keys in etcd can be refreshed notifying watchers
+Keys in etcd can be refreshed without notifying watchers
 this can be achieved by setting the refresh to true when updating a TTL
 
 You cannot update the value of a key when refreshing it