Rename fields referenced in comments

[stephentoub]

Some code bases talk about field in comments. Currently when the code formatter renames a field, it doesn't update the comment.

[jaredpar]

Do you mean via a <see cref="fieldName"/> or simply an unqualified name in the comment?

[stephentoub]

Regular comment, not XML. I realize it's just regular text, but without fixing it up, the code formatter in a sense breaks the comments. See dotnet/corefx#390 for a bunch of examples.

[jaredpar]

I agree that we should do this but the change does have the potential to do incorrect edits in the code. Refactor Rename in the IDE approaches this by making it an option in a rename operation. I think we should do the same here.