Fixed google#958

UserGuide.md

@@ -62,7 +62,7 @@ Note: Delete the `disabled_` prefix to run these tests. We use this prefix to pr
 
 ## <a name="TOC-Gson-Users"></a>Gson Users
 
-Gson was originally created for use inside Google where it is currently used in a number of projects. It is now used by a number of public projects and companies. See details [here](https://sites.google.com/site/gson/gson-users).
+Gson was originally created for use inside Google where it is currently used in a number of projects. It is now used by a number of public projects and companies.
 
 ## <a name="TOC-Using-Gson"></a>Using Gson
 
@@ -655,7 +655,7 @@ In addition Gson's object model and data binding, you can use Gson to read from
 
 ## <a name="TOC-Issues-in-Designing-Gson"></a>Issues in Designing Gson
 
-See the [Gson design document](https://sites.google.com/site/gson/gson-design-document "Gson design document") for a discussion of issues we faced while designing Gson. It also include a comparison of Gson with other Java libraries that can be used for Json conversion.
+See the [Gson design document](https://github.com/google/gson/blob/master/GsonDesignDocument.md "Gson design document") for a discussion of issues we faced while designing Gson. It also include a comparison of Gson with other Java libraries that can be used for Json conversion.
 
 ## <a name="TOC-Future-Enhancements-to-Gson"></a>Future Enhancements to Gson