Update obsolete comment.

Back-patch to all supported branches.

Author: Etsuro Fujita
Discussion: https://postgr.es/m/CAPmGK17DwzaSf%2BB71dhL2apXdtG-OmD6u2AL9Cq2ZmAR0%2BzapQ%40mail.gmail.com

contrib/postgres_fdw/postgres_fdw.c

@@ -617,8 +617,9 @@ postgresGetForeignRelSize(PlannerInfo *root,
 	fpinfo->server = GetForeignServer(fpinfo->table->serverid);
 
 	/*
-	 * Extract user-settable option values.  Note that per-table setting of
-	 * use_remote_estimate overrides per-server setting.
+	 * Extract user-settable option values.  Note that per-table settings of
+	 * use_remote_estimate and fetch_size override per-server settings of
+	 * them, respectively.
 	 */
 	fpinfo->use_remote_estimate = false;
 	fpinfo->fdw_startup_cost = DEFAULT_FDW_STARTUP_COST;