[DOC: PIR Motion Sensors] Fix MQTT topic to publish config for Home Assistant

[Ubiquitine]

I noticed that with the suggested topic in rule2, Home assistant doesn't detect the device/sensor.
After some digging with MQTT explorer I discovered that MQTT integration requires a particular structure of the topic tree under /homeassistant . Sensors configuration should be nested under their type parent-topics, e.g. /homeassistant/sensor/<Sensor ID>, or in that case /homeassistant/binary_sensor/<Sensor ID> .
Also, not included in the PR is additional parameter for the device:

rule2 on system#boot do publish2 homeassistant/binary_sensor/%topic%/config { "name": "Motion Sensor", "state_topic": "stat/%topic%/MOTION", "payload_on": 1, "availability_topic": "tele/%topic%/LWT", "payload_available": "Online", "payload_not_available": "Offline", "device_class": "motion", "force_update": true, "off_delay": 30, "unique_id": "%deviceid%_motion", "device": { "identifiers": [ "%deviceid%" ], "name": "WeMos D1 Mini" // Just an example, could be "%deviceid%" } } endon 

Without the name added to the device parameters, HA shows the sensor as Connected via Unnamed device