Fix docs on EchoNotificationDeleteJob and set explicit visibility on functions
Fix docs on EchoNotificationDeleteJob and set explicit visibility on functions

Change-Id: I7bfa6b9a7c2a78135005d05024d77a3319c7eed0

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo