carrierroute: spelling fix in comment

src/modules/carrierroute/cr_rule.h

@@ -48,7 +48,7 @@ struct route_rule
 	double orig_prob; /*!< The original probability for that rule, only useful when using crc32 hashing */
 	str host;		  /*!< The new target host for the request */
 	int strip; /*!< the number of digits to be stripped off from uri before prepending prefix */
-	str local_prefix; /*!< the pefix to be attached to the new destination */
+	str local_prefix; /*!< the prefix to be attached to the new destination */
 	str local_suffix; /*!< the suffix to be appended to the localpart of the new destination */
 	str comment; /*!< A comment for the route rule */
 	str prefix;	 /*!< The prefix for which the route is valid */