corrected the max events returned

Author: karman-docker

data/engine-cli/docker_system_events.yaml

@@ -7,7 +7,7 @@ long: |-
     scoped events are only seen on the node they take place on, and Swarm scoped
     events are seen on all managers.
 
-    Only the last 1000 log events are returned. You can use filters to further limit
+    Only the last 256 log events are returned. You can use filters to further limit
     the number of events returned.
 
     ### Object types
@@ -137,7 +137,7 @@ long: |-
     seconds (aka Unix epoch or Unix time), and the optional .nanoseconds field is a
     fraction of a second no more than nine digits long.
 
-    Only the last 1000 log events are returned. You can use filters to further limit
+    Only the last 256 log events are returned. You can use filters to further limit
     the number of events returned.
 
     #### Filtering (--filter) {#filter}