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

src/lib.rs

@@ -201,17 +201,17 @@ decl_event! {
 	{
 		/// Ethereum events from contracts.
 		Log(Log),
-		/// A contract has been created at given address.
+		/// A contract has been created at given [address].
 		Created(H160),
-		/// A contract was attempted to be created, but the execution failed.
+		/// A [contract] was attempted to be created, but the execution failed.
 		CreatedFailed(H160),
-		/// A contract has been executed successfully with states applied.
+		/// A [contract] has been executed successfully with states applied.
 		Executed(H160),
-		/// A contract has been executed with errors. States are reverted with only gas fees applied.
+		/// A [contract] has been executed with errors. States are reverted with only gas fees applied.
 		ExecutedFailed(H160),
-		/// A deposit has been made at a given address.
+		/// A deposit has been made at a given address. [sender, address, value]
 		BalanceDeposit(AccountId, H160, U256),
-		/// A withdrawal has been made from a given address.
+		/// A withdrawal has been made from a given address. [sender, address, value]
 		BalanceWithdraw(AccountId, H160, U256),
 	}
 }