More app-friendly event description (#6684)

* More app-friendly event description

* change origin -> owner

* checked all decl_event! and changed decriptions.

* annotated parameter names for remaining events

Author: warfollowsme

src/lib.rs

@@ -111,7 +111,8 @@ decl_event!(
 	pub enum Event {
 		/// There is an offence reported of the given `kind` happened at the `session_index` and
 		/// (kind-specific) time slot. This event is not deposited for duplicate slashes. last
-		/// element indicates of the offence was applied (true) or queued (false).
+		/// element indicates of the offence was applied (true) or queued (false) 
+		/// [kind, timeslot, applied].
 		Offence(Kind, OpaqueTimeSlot, bool),
 	}
 );