Update utils.js

Author: karimmakhloufi

lib/utils.js

@@ -374,7 +374,7 @@ var utils = module.exports = {
    * - close() : prevents further append() calls and does a last call to callbacks
    * - callback(cb) : calls cb for each line (incl. those already in the ring)
    *
-   * @param {Numebr} maxLines maximum number of lines to store (<= 0 for unlimited)
+   * @param {Number} maxLines maximum number of lines to store (<= 0 for unlimited)
    */
   linesRing: function(maxLines) {
     var cbs = [];