Reword mismatched-lifetime-syntaxes text based on feedback

Key changes include:

- Removal of the word "syntax" from the lint message. More accurately,
  it could have been something like "syntax group" or "syntax
  category", but avoiding it completely is easier.
- The primary lint message now reflects exactly which mismatch is
  occurring, instead of trying to be general. A new `help` line is
  general across the mismatch kinds.
- Suggestions have been reduced to be more minimal, no longer also
  changing non-idiomatic but unrelated aspects.
- Suggestion text no longer mentions changes when those changes don't
  occur in that specific suggestion.

0 files changed, 0 insertions, 0 deletions