ip-rule: neither prohibit nor reject or unreachable flags exist

This has been inconsistent since the beginning of Git and seems to be
merely a documentation leftover, therefore just remove it from help
output and man page.
Signed-off-by: Phil Sutter <phil@nwl.cc>

ip/iprule.c

@@ -36,7 +36,6 @@ static void usage(void)
 	fprintf(stderr, "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n");
 	fprintf(stderr, "            [ iif STRING ] [ oif STRING ] [ pref NUMBER ]\n");
 	fprintf(stderr, "ACTION := [ table TABLE_ID ]\n");
-	fprintf(stderr, "          [ prohibit | reject | unreachable ]\n");
 	fprintf(stderr, "          [ realms [SRCREALM/]DSTREALM ]\n");
 	fprintf(stderr, "          [ goto NUMBER ]\n");
 	fprintf(stderr, "          SUPPRESSOR\n");

man/man8/ip-rule.8

@@ -41,7 +41,7 @@ ip-rule \- routing policy database management
 .IR TABLE_ID " ] [ "
 .B  nat
 .IR ADDRESS " ] [ "
-.BR prohibit " | " reject " | " unreachable " ] [ " realms
+.B realms
 .RI "[" SRCREALM "/]" DSTREALM " ]"
 .I  SUPPRESSOR