Unify some error messages

contrib/pg_prewarm/autoprewarm.c

@@ -867,7 +867,7 @@ apw_start_database_worker(void)
 		ereport(ERROR,
 				(errcode(ERRCODE_INSUFFICIENT_RESOURCES),
 				 errmsg("registering dynamic bgworker autoprewarm failed"),
-				 errhint("Consider increasing configuration parameter \"max_worker_processes\".")));
+				 errhint("Consider increasing the configuration parameter \"%s\".", "max_worker_processes")));
 
 	/*
 	 * Ignore return value; if it fails, postmaster has died, but we have

src/backend/postmaster/bgworker.c

@@ -928,7 +928,7 @@ RegisterBackgroundWorker(BackgroundWorker *worker)
 								  "Up to %d background workers can be registered with the current settings.",
 								  max_worker_processes,
 								  max_worker_processes),
-				 errhint("Consider increasing the configuration parameter \"max_worker_processes\".")));
+				 errhint("Consider increasing the configuration parameter \"%s\".", "max_worker_processes")));
 		return;
 	}