chore: Update multi-line suggestion docs
What does this MR do and why?
See introduction in #232339 (closed) but we never documented this.
The other docs seem a bit dated as well without the latest UI, but this was a smaller change to make. The wording itself is pretty awkward, suggestions most welcome!
Screenshots or screen recordings
Example of behavior this is documenting:
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Lucas Charles