Added params to member_builder.initMembers() docblock

lib/member_builder.js

@@ -29,6 +29,10 @@
  * The member object contains members for each level of visibility (public,
  * protected and private).
  *
+ * @param  {Object}  mpublic     default public members
+ * @param  {Object}  mprotected  default protected members
+ * @param  {Object}  mprivate    default private members
+ *
  * @return  {{public: Object, protected: Object, private: Object}}
  */
 exports.initMembers = function( mpublic, mprotected, mprivate )