Docs on how to enable extension for all users do not stand out at all

Created by: slimsag

1. Go to this page: https://docs.sourcegraph.com/extensions/usage
2. Find the section that describes enabling for all users.
3. It is hidden at the very bottom of the page, and so short that it's not very visible.

Adding a screenshot could help? cc @KattMingMing

Reported by https://app.hubspot.com/contacts/2762526/company/407948923 but not affecting them.