pg_dump: Improve message formatting

src/bin/pg_dump/pg_dump.c

@@ -675,9 +675,9 @@ main(int argc, char **argv)
 	if (numWorkers > 1 && fout->remoteVersion < 90200
 		&& !no_synchronized_snapshots)
 		exit_horribly(NULL,
-			  "No synchronized snapshots available in this server version.\n"
-			   "Run with --no-synchronized-snapshots instead if you do not\n"
-					  "need synchronized snapshots.\n");
+					  "Synchronized snapshots are not supported by this server version.\n"
+					  "Run with --no-synchronized-snapshots instead if you do not need\n"
+					  "synchronized snapshots.\n");
 
 	/* Find the last built-in OID, if needed */
 	if (fout->remoteVersion < 70300)
@@ -891,7 +891,7 @@ help(const char *progname)
 	printf(_("  --exclude-table-data=TABLE   do NOT dump data for the named table(s)\n"));
 	printf(_("  --inserts                    dump data as INSERT commands, rather than COPY\n"));
 	printf(_("  --no-security-labels         do not dump security label assignments\n"));
-	printf(_("  --no-synchronized-snapshots parallel processes should not use synchronized snapshots\n"));
+	printf(_("  --no-synchronized-snapshots  do not use synchronized snapshots in parallel jobs\n"));
 	printf(_("  --no-tablespaces             do not dump tablespace assignments\n"));
 	printf(_("  --no-unlogged-table-data     do not dump unlogged table data\n"));
 	printf(_("  --quote-all-identifiers      quote all identifiers, even if not key words\n"));