Chaning github repository to our gerrit repository

Change-Id: I51ff03d516eecf00a659bade8e15802debfffc5e
diff --git a/openstack/compute/v2/extensions/volumeattach/testing/doc.go b/openstack/compute/v2/extensions/volumeattach/testing/doc.go
index 2cc0ab4..846e3ce 100644
--- a/openstack/compute/v2/extensions/volumeattach/testing/doc.go
+++ b/openstack/compute/v2/extensions/volumeattach/testing/doc.go
@@ -5,5 +5,5 @@
 Package testing holds fixtures (which imports testing),
 so that importing volumeattach package does not inadvertently import testing into production code
 More information here:
-https://github.com/gophercloud/gophercloud/issues/473
+https://gerrit.mcp.mirantis.net/debian/gophercloud.git/issues/473
 */