Removes a copy and paste leftover in the element-admin doc

docs/configuring-playbook-element-admin.md

@@ -66,6 +66,3 @@ The shortcut commands with the [`just` program](just.md) are also available: `ju
 
 `just install-all` is useful for maintaining your setup quickly ([2x-5x faster](../CHANGELOG.md#2x-5x-performance-improvements-in-playbook-runtime) than `just setup-all`) when its components remain unchanged. If you adjust your `vars.yml` to remove other components, you'd need to run `just setup-all`, or these components will still remain installed. Note these shortcuts run the `ensure-matrix-users-created` tag too.
 
-## Usage
-
-Once installed, Element Call integrates seamlessly with Matrix clients like [Element Web](configuring-playbook-client-element-web.md) and Element X on mobile (iOS and Android).