Merge pull request apache#1843 from gianm/config-doc-fix

"druid.manager.segment" should be "druid.manager.segments"

docs/content/configuration/coordinator.md

@@ -34,7 +34,7 @@ The coordinator node uses several of the global configs in [Configuration](../co
 |Property|Description|Default|
 |--------|-----------|-------|
 |`druid.manager.config.pollDuration`|How often the manager polls the config table for updates.|PT1m|
-|`druid.manager.segment.pollDuration`|The duration between polls the Coordinator does for updates to the set of active segments. Generally defines the amount of lag time it can take for the coordinator to notice new segments.|PT1M|
+|`druid.manager.segments.pollDuration`|The duration between polls the Coordinator does for updates to the set of active segments. Generally defines the amount of lag time it can take for the coordinator to notice new segments.|PT1M|
 |`druid.manager.rules.pollDuration`|The duration between polls the Coordinator does for updates to the set of active rules. Generally defines the amount of lag time it can take for the coordinator to notice rules.|PT1M|
 |`druid.manager.rules.defaultTier`|The default tier from which default rules will be loaded from.|_default|
 |`druid.manager.rules.alertThreshold`|The duration after a failed poll upon which an alert should be emitted.|PT10M|