Fix misleading comment about RewardHandler in epm config (paritytech#…

…3095)

In pallet_election_provider_multi_phase::Config, the effect of

       type RewardHandler = ()

is to mint rewards from the void, not "nothing to do upon rewards"

Co-authored-by: navigaid <navigaid@gmail.com>
Co-authored-by: Bastian Köcher <git@kchr.de>

polkadot/runtime/westend/src/lib.rs

@@ -630,7 +630,7 @@ impl pallet_election_provider_multi_phase::Config for Runtime {
 		<Self::MinerConfig as pallet_election_provider_multi_phase::MinerConfig>::MaxWeight;
 	type MinerConfig = Self;
 	type SlashHandler = (); // burn slashes
-	type RewardHandler = (); // nothing to do upon rewards
+	type RewardHandler = (); // rewards are minted from the void
 	type BetterSignedThreshold = ();
 	type OffchainRepeat = OffchainRepeat;
 	type MinerTxPriority = NposSolutionPriority;

substrate/bin/node/runtime/src/lib.rs

@@ -852,7 +852,7 @@ impl pallet_election_provider_multi_phase::Config for Runtime {
 	type SignedDepositWeight = ();
 	type SignedMaxWeight = MinerMaxWeight;
 	type SlashHandler = (); // burn slashes
-	type RewardHandler = (); // nothing to do upon rewards
+	type RewardHandler = (); // rewards are minted from the void
 	type DataProvider = Staking;
 	type Fallback = onchain::OnChainExecution<OnChainSeqPhragmen>;
 	type GovernanceFallback = onchain::OnChainExecution<OnChainSeqPhragmen>;