docs: clarify botstopper kubernetes instructions (#1404)

This makes it clear that when generating a kubernetes secret to pull the bot stopper image that:
- no email is required
- a user is required but the actual value of the username is not checked
- the GH token needs to be pasted in

Signed-off-by: Thomas Arrow <tarrow@users.noreply.github.com>

docs/docs/admin/botstopper.mdx

@@ -51,9 +51,8 @@ If you are using Kubernetes, you will need to create an image pull secret:
 kubectl create secret docker-registry \
   techarohq-botstopper \
   --docker-server ghcr.io \
-  --docker-username your-username \
-  --docker-password your-access-token \
-  --docker-email your@email.address
+  --docker-username any-username \
+  --docker-password <your-access-token> \
 ```
 
 Then attach it to your Deployment: