DOCS: Update options.txt for the removal of compatible

This obviously shouldn't go in until #1622 and probably #228, but I figured I'd at least get it started. I also didn't want to just tack it onto one of those PRs as this one might need more work to get just right.

The text for the "compatible" option might need more work.This obviously shouldn't go in until #1622 and probably #228, but I figured I'd at least get it started. I also didn't want to just tack it onto one of those PRs as this one might need more work to get just right.

The text for the "compatible" option might need more work.