Refactor contractions rules

What does this MR do?

Refactors the contractions rules we have along the lines of: technical-writing#218 (closed).

We probably aren't getting a lot of value from splitting them still at this point. We could just use a more generic message that avoids the need to split them at all.

Either way, I think this in an improvement on current state. I've also elevated these to a warning, happy for feedback on that.

I'll send across to @ngaskill and @aqualls for review.

CC @gl-docsteam

Related issues

Closes: technical-writing#218 (closed).

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