Update docs/configuring-playbook-mautrix-bridges.md: move the section "Set up Double Puppeting" to "Usage"

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-mautrix-bridges.md

@@ -129,7 +129,15 @@ ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,ensure-matrix-use
 
   `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.
 
-## Set up Double Puppeting (optional)
+## Usage
+
+To use the bridge, you need to start a chat with `@SERVICENAMEbot:example.com` (where `example.com` is your base domain, not the `matrix.` domain).
+
+Send `login` to the bridge bot to get started. You can learn more here about authentication from the bridge's official documentation on Authentication: https://docs.mau.fi/bridges/python/SERVICENAME/authentication.html
+
+If you run into trouble, check the [Troubleshooting](#troubleshooting) section below.
+
+### Set up Double Puppeting (optional)
 
 To set up [Double Puppeting](https://docs.mau.fi/bridges/general/double-puppeting.html) enable the [Appservice Double Puppet](configuring-playbook-appservice-double-puppet.md) service for this playbook.
 
@@ -141,14 +149,6 @@ matrix_appservice_double_puppet_enabled: true
 
 This is the recommended way of setting up Double Puppeting, as it's easier to accomplish, works for all your users automatically, and has less of a chance of breaking in the future.
 
-## Usage
-
-To use the bridge, you need to start a chat with `@SERVICENAMEbot:example.com` (where `example.com` is your base domain, not the `matrix.` domain).
-
-Send `login` to the bridge bot to get started. You can learn more here about authentication from the bridge's official documentation on Authentication: https://docs.mau.fi/bridges/python/SERVICENAME/authentication.html
-
-If you run into trouble, check the [Troubleshooting](#troubleshooting) section below.
-
 ## Troubleshooting
 
 For troubleshooting information with a specific bridge, please see the playbook documentation about it (some other document in in `docs/`) and the upstream ([mautrix](https://github.com/mautrix)) bridge documentation for that specific bridge.