fix comment

svm/examples/paytube/src/processor.rs

@@ -104,7 +104,7 @@ pub(crate) fn create_transaction_batch_processor<CB: TransactionProcessingCallba
     processor
 }
 
-/// This functions is also a mock. In the Agave validator, the bank pre-checks
+/// This function is also a mock. In the Agave validator, the bank pre-checks
 /// transactions before providing them to the SVM API. We mock this step in
 /// PayTube, since we don't need to perform such pre-checks.
 pub(crate) fn get_transaction_check_results(