fix comments

crates/astria-sequencer/src/service/mempool/mod.rs

@@ -171,7 +171,6 @@ async fn check_tracked(
 ) -> Option<response::CheckTx> {
     let start_tracked_check = Instant::now();
 
-    // check if the transaction is in the mempool already, return early if it is
     if mempool.tracked(tx_hash).await {
         return Some(response::CheckTx::default());
     }
@@ -195,7 +194,8 @@ async fn check_removed_comet_bft(
 ) -> Option<response::CheckTx> {
     let start_removal_check = Instant::now();
 
-    // check if the transaction has been removed from the appside mempool
+    // check if the transaction has been removed from the appside mempool and handle
+    // the removal reason
     if let Some(removal_reason) = mempool.check_removed_comet_bft(tx_hash).await {
         match removal_reason {
             RemovalReason::Expired => {
@@ -357,6 +357,7 @@ async fn insert_into_mempool<S: accounts::StateReadExt + address::StateReadExt +
 ) -> Option<response::CheckTx> {
     let start_convert_address = Instant::now();
 
+    // generate address for the signed transaction
     let address = match state
         .try_base_prefixed(&signed_tx.verification_key().address_bytes())
         .await