docs: fix dox parsing issue by using RegExp object

Author: stephenplusplus

lib/datastore/dataset.js

@@ -115,8 +115,9 @@ function Dataset(options) {
     options.apiEndpoint = 'http://' + options.apiEndpoint;
   }
 
+  var trailingSlashes = new RegExp('/*$');
   this.apiEndpoint = options.apiEndpoint || 'https://www.googleapis.com';
-  this.apiEndpoint = this.apiEndpoint.replace(/\/*$/, '');
+  this.apiEndpoint = this.apiEndpoint.replace(trailingSlashes, '');
 
   this.namespace = options.namespace;
   this.projectId = options.projectId;
@@ -134,6 +135,7 @@ nodeutil.inherits(Dataset, DatastoreRequest);
  * @param {object=} options - Configuration object.
  * @param {...*=} options.path - Key path.
  * @param {string=} options.namespace - Optional namespace.
+ * @return {Key} A newly created Key from the options given.
  *
  * @example
  * var key;
@@ -153,8 +155,6 @@ nodeutil.inherits(Dataset, DatastoreRequest);
  *   namespace: 'My-NS',
  *   path: ['Company', 123]
  * });
- *
- * @return {Key} A newly created Key from the options given.
  */
 Dataset.prototype.key = function(options) {
   options = util.is(options, 'object') ? options : {