GitLab

- Shorten a bit
- Favor present tense
- Split long sentences
- Avoid 'this'

- Fix broken shortcut
- Shorten a bit
- Avoid 'it'
- Prefer present tense

- Improve phrasing for the reader.
- Make it more clear what we are talking about in the known issues.
- To maintain the list, move the section that's commented out.

This is a bug and an inconvenient thing to ask for.

It doesn't matter if people have been upgrading for a while or not. If
their boot is broken after an automatic upgrades they should do a manual
upgrade anyway.