* Fixes to configuration description and example.
Alignment with new documentation guidelines (https://developers.home-assistant.io/docs/en/documentation_standards.html)
* Fixed of sample config and documentation
Alignment with new documentation guidelines.
* Update sensor.waqi.markdown
* Update sensor.bom.markdown
* Update sensor.bom.markdown
* Add new parameter to sensor.aqi
A city might have more stations than is needed. Adding an optional station parameter to restrict results.
* Update sensor.waqi.markdown