Reinforcing accessibility of change logs

[daniel-montalvo]

I've gotten comments that certain TR documents indicate changes using color alone. In most cases they are also providing a Diff or a change log (which is accessible) and that resolves the issue. But if for whatever reason there ends up being a document indicating changes with color alone, that'd be an accessibility problem. I think it would be wise for us to add an explicit mention to accessibility when it comes to providing a list of changes. For example, all places where we say:

It must include a link to changes since the previous draft (e.g., a list of changes or a diff document or both; see the online HTML diff tool). The group must indicate which changes may affect conformance.

For example, adding "accessible" in front of "list" so that it says "accessible list of changes", just to add that slight remark.