docs: remove stray paragraph in notifications (#949)

* docs: remove stray paragraph in notifications

fixes #946

* docs: add the lost paragraph to own page

docs/notifications.md

@@ -112,8 +112,6 @@ networks:
 
 ### Slack
 
-If watchtower is monitoring the same Docker daemon under which the watchtower container itself is running (i.e. if you volume-mounted _/var/run/docker.sock_ into the watchtower container) then it has the ability to update itself. If a new version of the _containrrr/watchtower_ image is pushed to the Docker Hub, your watchtower will pull down the new image and restart itself automatically.
-
 To receive notifications in Slack, add `slack` to the `--notifications` option or the `WATCHTOWER_NOTIFICATIONS` environment variable.
 
 Additionally, you should set the Slack webhook URL using the `--notification-slack-hook-url` option or the `WATCHTOWER_NOTIFICATION_SLACK_HOOK_URL` environment variable. This option can also reference a file, in which case the contents of the file are used.

docs/updating.md

@@ -0,0 +1,6 @@
+## Updating Watchtower
+
+If watchtower is monitoring the same Docker daemon under which the watchtower container itself is running (i.e. if you 
+volume-mounted `/var/run/docker.sock` into the watchtower container) then it has the ability to update itself.  
+If a new version of the `containrrr/watchtower` image is pushed to the Docker Hub, your watchtower will pull down the 
+new image and restart itself automatically.