Fix Comments (#878)

## Describe your changes
Update Transaction Payment - signed extra

## Checklist before requesting a review
- [x] I have performed a self-review of my code.
- [ ] If it is a core feature, I have added thorough tests.
- [x] I removed all Clippy and Formatting Warnings. 
- [x] I added required Copyrights.

nodes/mainnet/src/command.rs

@@ -107,7 +107,6 @@ pub fn run() -> Result<()> {
 							)
 						}
 
-						//TODO: @Gautham - Check this
 						cmd.run::<Block, sp_statement_store::runtime_api::HostFunctions>(config)
 					},
 					BenchmarkCmd::Block(cmd) => {

nodes/mainnet/src/service.rs

@@ -94,8 +94,7 @@ pub fn create_extrinsic(
 	let tip = 0;
 	let extra: node_polkadex_runtime::SignedExtra =
 		(
-			//TODO: Why it is commented?
-			//frame_system::CheckNonZeroSender::<node_polkadex_runtime::Runtime>::new(),
+			frame_system::CheckNonZeroSender::<node_polkadex_runtime::Runtime>::new(),
 			frame_system::CheckSpecVersion::<node_polkadex_runtime::Runtime>::new(),
 			frame_system::CheckTxVersion::<node_polkadex_runtime::Runtime>::new(),
 			frame_system::CheckGenesis::<node_polkadex_runtime::Runtime>::new(),
@@ -114,6 +113,7 @@ pub fn create_extrinsic(
 		function.clone(),
 		extra.clone(),
 		(
+			(),
 			node_polkadex_runtime::VERSION.spec_version,
 			node_polkadex_runtime::VERSION.transaction_version,
 			genesis_hash,
@@ -851,6 +851,7 @@ mod tests {
 					function.clone(),
 					extra.clone(),
 					(
+						(),
 						node_polkadex_runtime::VERSION.spec_version,
 						node_polkadex_runtime::VERSION.transaction_version,
 						genesis_hash,

runtimes/mainnet/src/lib.rs

@@ -575,7 +575,7 @@ impl pallet_staking::Config for Runtime {
 	// This a placeholder, to be introduced in the next PR as an instance of bags-list
 	type TargetList = pallet_staking::UseValidatorsMap<Self>;
 	type MaxUnlockingChunks = ConstU32<32>;
-	type EventListeners = (); //TODO: Should we update this?
+	type EventListeners = ();
 	type BenchmarkingConfig = StakingBenchmarkingConfig;
 	type WeightInfo = pallet_staking::weights::SubstrateWeight<Runtime>;
 }
@@ -1051,10 +1051,11 @@ where
 			// so the actual block number is `n`.
 			.saturating_sub(1);
 		let extra = (
+			frame_system::CheckNonZeroSender::<Runtime>::new(),
 			frame_system::CheckSpecVersion::<Runtime>::new(),
 			frame_system::CheckTxVersion::<Runtime>::new(),
 			frame_system::CheckGenesis::<Runtime>::new(),
-			frame_system::CheckMortality::<Runtime>::from(generic::Era::mortal(
+			frame_system::CheckEra::<Runtime>::from(generic::Era::mortal(
 				period,
 				current_block,
 			)),
@@ -1574,17 +1575,16 @@ pub type BlockId = generic::BlockId<Block>;
 ///
 /// [`sign`]: <../../testing/src/keyring.rs.html>
 pub type SignedExtra = (
+	frame_system::CheckNonZeroSender<Runtime>,
 	frame_system::CheckSpecVersion<Runtime>,
 	frame_system::CheckTxVersion<Runtime>,
 	frame_system::CheckGenesis<Runtime>,
-	frame_system::CheckMortality<Runtime>,
+	frame_system::CheckEra<Runtime>,
 	frame_system::CheckNonce<Runtime>,
 	frame_system::CheckWeight<Runtime>,
 	pallet_asset_conversion_tx_payment::ChargeAssetTxPayment<Runtime>,
 );
-//TODO: two things are missing?
-//	frame_system::CheckNonZeroSender<Runtime>,
-//	frame_system::CheckEra<Runtime>,
+
 /// Unchecked extrinsic type as expected by this runtime.
 pub type UncheckedExtrinsic =
 	generic::UncheckedExtrinsic<Address, RuntimeCall, Signature, SignedExtra>;