Replace git.openstack.org URLs with opendev.org URLs

Change-Id: I10a98d16f9df6bdae5aa1b0751d28c6439a7fc12
diff --git a/doc/source/installation.rst b/doc/source/installation.rst
index 28c6297..7d23024 100644
--- a/doc/source/installation.rst
+++ b/doc/source/installation.rst
@@ -8,6 +8,6 @@
 
 At the command line::
 
-    $ git clone https://git.openstack.org/openstack/telemetry-tempest-plugin
+    $ git clone https://opendev.org/openstack/telemetry-tempest-plugin
     $ cd telemetry-tempest-plugin/
     $ pip install telemetry-tempest-plugin