Indicate default format in --help output of pg_dump and pg_basebackup

src/bin/pg_basebackup/pg_basebackup.c

@@ -105,7 +105,7 @@ usage(void)
 	printf(_("  %s [OPTION]...\n"), progname);
 	printf(_("\nOptions controlling the output:\n"));
 	printf(_("  -D, --pgdata=DIRECTORY   receive base backup into directory\n"));
-	printf(_("  -F, --format=p|t         output format (plain, tar)\n"));
+	printf(_("  -F, --format=p|t         output format (plain (default), tar)\n"));
 	printf(_("  -x, --xlog=fetch|stream  include required WAL files in backup\n"));
 	printf(_("  -z, --gzip               compress tar output\n"));
 	printf(_("  -Z, --compress=0-9       compress tar output with given compression level\n"));

src/bin/pg_dump/pg_dump.c

@@ -860,7 +860,8 @@ help(const char *progname)
 
 	printf(_("\nGeneral options:\n"));
 	printf(_("  -f, --file=FILENAME         output file or directory name\n"));
-	printf(_("  -F, --format=c|d|t|p        output file format (custom, directory, tar, plain text)\n"));
+	printf(_("  -F, --format=c|d|t|p        output file format (custom, directory, tar,\n"
+			 "                              plain text (default))\n"));
 	printf(_("  -v, --verbose               verbose mode\n"));
 	printf(_("  -Z, --compress=0-9          compression level for compressed formats\n"));
 	printf(_("  --lock-wait-timeout=TIMEOUT fail after waiting TIMEOUT for a table lock\n"));