small changes

docs/installation_instructions.rst

@@ -372,7 +372,7 @@ to install:
 - Nextcloud and Onlyoffice with ``install-nextcloud.sh``
 - Rocket.Chat with ``install-rocketchat.sh``
 - WordPress with ``install-wordpress.sh``
-- Velero with ``install-velero.sh`` (make sure you have configured it in
+- Velero with ``install-velero.sh`` (only if you have configured it in
   :ref:`backups-with-velero`).
 
 .. _step-6:

docs/testing_instructions.md

@@ -80,7 +80,7 @@ machine's config directory.
 
 ## Providing feedback
 
-If you have not done already, please create an account on [https://open.greenhost.net](https://open.greenhost.net)
+If you have not done so already, please create an account on [https://open.greenhost.net](https://open.greenhost.net)
 (or login with your existing github account) and [create a new issue](https://open.greenhost.net/openappstack/openappstack/issues/new) using the `Feedback` template.
 
 Thanks a lot for your testing work! We'll use your input to try to improve OpenAppStack.