[DOC] Fix repo link (#295)

* Update index.rst

* Update index.rst

docs/source/index.rst

@@ -41,7 +41,7 @@ Free software
 -------------
 DGL is free software; you can redistribute it and/or modify it under the terms
 of the Apache License 2.0. We welcome contributions.
-Join us on `GitHub <https://github.com/jermainewang/dgl>`_.
+Join us on `GitHub <https://github.com/dmlc/dgl>`_ and checkout our `contribution guidelines <https://github.com/dmlc/dgl/blob/master/CONTRIBUTING.md>`_.
 
 History
 -------

docs/source/install/index.rst

@@ -74,7 +74,7 @@ First, download the source files from GitHub:
 
 .. code:: bash
 
-   git clone --recursive https://github.com/jermainewang/dgl.git
+   git clone --recursive https://github.com/dmlc/dgl.git
 
 One can also clone the repository first and run the following: