Embedded MQTT password change backport to 0.76 (home-assistant#6020)

* Embedded MQTT password change backport to 0.76

* Fix formatting

Author: awarecan

source/_docs/mqtt/broker.markdown

@@ -25,7 +25,7 @@ Home Assistant contains an embedded MQTT broker. If no broker configuration is g
 | Password       | no default value |
 | Websocket port | 8080 |
 
-> Since release 0.77, the embedded broker does not use your [API password](/components/http/) as the default password. The MQTT component will fail to set up if you have API password configured, but don't have MQTT password configured as in the following example.
+Since release 0.76, the embedded broker does not use your [API password](/components/http/) as the default password. The MQTT component will fail to set up if you have API password configured, but don't have MQTT password configured as in the following example.
 
 ```yaml
 # Example configuration.yaml entry