Polishing log message and comment

Closes gh-7793

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/transaction/TransactionManagerCustomizers.java

@@ -66,7 +66,7 @@ public class TransactionManagerCustomizers {
 			customizer.customize(transactionManager);
 		}
 		catch (ClassCastException ex) {
-			// Possibly a lambda-defined listener which we could not resolve the generic
+			// Possibly a lambda-defined customizer which we could not resolve the generic
 			// event type for
 			if (logger.isDebugEnabled()) {
 				logger.debug("Non-matching transaction manager type for customizer: "