update api comments for search_api

lib/api/search.js

@@ -1,5 +1,15 @@
 var search_api = function(){};
 search_api.prototype.search = function(query, callback){
+    /*
+     * search_api.search(query, [callback])
+     *
+     * method used to query the api for `metrics` or `hosts`
+     *
+     * `query` the query to use to search the datadog service
+     *
+     * `callback` an optional function called with the results of the search
+     *     callback(error, result, status_code)
+    */
     this.request('GET', '/search', {query: {'q': query}}, callback);
 };