Improve Telegram/Whatsapp instructions

docs/configuring-playbook-bridge-mautrix-telegram.md

@@ -12,4 +12,4 @@ matrix_mautrix_telegram_api_id: YOUR_TELEGRAM_APP_ID
 matrix_mautrix_telegram_api_hash: YOUR_TELEGRAM_API_HASH
 ```
 
-You then need to start a chat with `@telegrambot:{{ hostname_identity }}`
+You then need to start a chat with `@telegrambot:YOUR_DOMAIN` (where `YOUR_DOMAIN` is your base hostname, not the `matrix.` hostname).

docs/configuring-playbook-bridge-mautrix-whatsapp.md

@@ -10,4 +10,4 @@ Use the following playbook configuration:
 matrix_mautrix_whatsapp_enabled: true
 ```
 
-You then need to start a chat with `@whatsappbot:{{ hostname_identity }}`
+You then need to start a chat with `@whatsappbot:YOUR_DOMAIN` (where `YOUR_DOMAIN` is your base hostname, not the `matrix.` hostname).