config: fix short help of unset flags

The flags --all and --value of "git config unset" don't make the command
"replace" or "show" anything, they are about selecting what to unset.
Change their help text accordingly.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: rscharfe

builtin/config.c

@@ -992,8 +992,8 @@ static int cmd_config_unset(int argc, const char **argv, const char *prefix,
 	struct option opts[] = {
 		CONFIG_LOCATION_OPTIONS(location_opts),
 		OPT_GROUP(N_("Filter")),
-		OPT_BIT(0, "all", &flags, N_("replace multi-valued config option with new value"), CONFIG_FLAGS_MULTI_REPLACE),
-		OPT_STRING(0, "value", &value_pattern, N_("pattern"), N_("show config with values matching the pattern")),
+		OPT_BIT(0, "all", &flags, N_("unset all multi-valued config options"), CONFIG_FLAGS_MULTI_REPLACE),
+		OPT_STRING(0, "value", &value_pattern, N_("pattern"), N_("unset multi-valued config options with matching values")),
 		OPT_BIT(0, "fixed-value", &flags, N_("use string equality when comparing values to value pattern"), CONFIG_FLAGS_FIXED_VALUE),
 		OPT_END(),
 	};