Entity Button Card and call-service modbus.write_register

[VDRainer]

Cool! If you want, you can update the docs.

Editing the Documentation and Creating a Pull Request on Github

I have seen a number of people complain about the documentation at https://home-assistant.io/ (HA site). Great news! Everyone can edit it and provide improvements to the documentation. Next thing I likely see is that people don’t know how to create a pull request on Github. Great news! Here is a tutorial on how to do it. First go to https://github.com/ and sign up for an account. Its quick free and easy. If there is a need for a tutorial for this too, please post that feedback below. O…