Fix typos in logical replication code comments

Author: Chao Li <lic@highgo.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/CAEoWx2kt8m7wV39_zOBds5SNXx9EAkDqb5cPshk7Bxw6Js4Zpg@mail.gmail.com

src/backend/commands/subscriptioncmds.c

@@ -680,7 +680,7 @@ CreateSubscription(ParseState *pstate, CreateSubscriptionStmt *stmt,
 	}
 
 	/*
-	 * Ensure that system configuration paramters are set appropriately to
+	 * Ensure that system configuration parameters are set appropriately to
 	 * support retain_dead_tuples and max_retention_duration.
 	 */
 	CheckSubDeadTupleRetention(true, !opts.enabled, WARNING,
@@ -1637,7 +1637,7 @@ AlterSubscription(ParseState *pstate, AlterSubscriptionStmt *stmt,
 				}
 
 				/*
-				 * Ensure that system configuration paramters are set
+				 * Ensure that system configuration parameters are set
 				 * appropriately to support retain_dead_tuples and
 				 * max_retention_duration.
 				 */

src/backend/replication/logical/launcher.c

@@ -1301,7 +1301,7 @@ ApplyLauncherMain(Datum main_arg)
 					can_update_xmin &= sub->enabled;
 
 					/*
-					 * Initialize the slot once the subscription activiates
+					 * Initialize the slot once the subscription activates
 					 * retention.
 					 */
 					if (!TransactionIdIsValid(MyReplicationSlot->data.xmin))