Various fixes to bring the page closer to GitLab tone and style,
including:

- fix spelling
- bring each link onto one line, for better syntax highlighting
- revise for passive voice
- revise linking text to describe the page being linked to, rather
  than using words like 'here' and 'this issue' (semantic linking
  words)
- take out a forward-looking statement - we need to keep those out
  of our documentation for legal reasons