Fix typo

clients/tools/common.c

@@ -215,7 +215,7 @@ N_("  -O props   SASL security properties\n"),
 N_("  -o <opt>[=<optparam] general options\n"),
 N_("             nettimeout=<timeout> (in seconds, or \"none\" or \"max\")\n"),
 N_("  -p port    port on LDAP server\n"),
-N_("  -P version procotol version (default: 3)\n"),
+N_("  -P version protocol version (default: 3)\n"),
 N_("  -Q         use SASL Quiet mode\n"),
 N_("  -R realm   SASL realm\n"),
 N_("  -U authcid SASL authentication identity\n"),