Update documentation to refer to github

AdvancedUsage.md

@@ -34,7 +34,7 @@ Once your environment is ready, you can start developing against the stack. Let'
 
 	```bash
 	$ cd $HOME
-	$ git clone git@git.lsstcorp.org:LSST/DMS/obs_cfht.git -b tickets/DM-1380
+	$ git clone https://github.com/lsst/obs_cfht -b tickets/DM-1380
 	$ cd obs_cfht
 	```
 	
@@ -68,4 +68,4 @@ Once your environment is ready, you can start developing against the stack. Let'
 
 ## Doesn't work for you? Do you have a different use case not covered here?
 
-If this document did not solve your problem or you have a use case not covered here let us know by [opening an issue](https://github.com/airnandez/lsst-cvmfs/issues).
\ No newline at end of file
+If this document did not solve your problem or you have a use case not covered here let us know by [opening an issue](https://github.com/airnandez/lsst-cvmfs/issues).