checkpolicy: Update manpage

- Add description of -S option
- Sort the option descriptions based on the synopsis
- Add missing options to synopsis

Signed-off-by: Vit Mojzis <vmojzis@redhat.com>
diff --git a/checkpolicy/checkpolicy.c b/checkpolicy/checkpolicy.c
index 14dc91a..e0a00f7 100644
--- a/checkpolicy/checkpolicy.c
+++ b/checkpolicy/checkpolicy.c
@@ -113,7 +113,7 @@
 	printf
 	    ("usage:  %s [-b[F]] [-C] [-d] [-U handle_unknown (allow,deny,reject)] [-M] "
 	     "[-c policyvers (%d-%d)] [-o output_file] [-S] "
-	     "[-t target_platform (selinux,xen)] [input_file]\n",
+	     "[-t target_platform (selinux,xen)] [-V] [input_file]\n",
 	     progname, POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
 	exit(1);
 }