Initial pull request message improvements

[targos]

I'm not sure this project is the right place to open the issue. Sorry if the message is generated elsewhere.
I'm taking this message as a reference: nodejs/TSC#1225 (comment)

1. When I voted, I didn't think that a readable version of the voting options was available in the first commit, so I thought that I had to start the process to know what the options were. My suggestion would be to add the list of options to the pull request description, before listing the different voting methods.
2. That may be more difficult to handle here, but I think it's important to make sure that all people how are allowed to vote are aware that a vote started. In the case of the Node.js TSC, I would add a ping of the @nodejs/tsc GitHub team to the pull request description.