Fix help text to match the manual and the actual behavior

The help text mentions "LIST" and "KILL" commands, but the manual says
"list" and "kill", and the command line parser expects the later.

sesman/tools/sesadmin.c

@@ -183,8 +183,8 @@ void cmndHelp()
     fprintf(stderr, "-i=<port>    : sesman port (default 3350)\n");
     fprintf(stderr, "-c=<command> : command to execute on the server [MANDATORY]\n");
     fprintf(stderr, "               it can be one of those:\n");
-    fprintf(stderr, "               LIST\n");
-    fprintf(stderr, "               KILL:<sid>\n");
+    fprintf(stderr, "               list\n");
+    fprintf(stderr, "               kill:<sid>\n");
 }
 
 void cmndList(struct SCP_CONNECTION *c)