Make comment box during document approval expandable/scrollable, more characters

[#1]

We'd like the comment box that appears when making an approval decision on a document be more useful. Right now, the box has a low character limit and isn't scrollable. USER CASE: the approver adds a few small changes, that the document owner needs to make, in the comment box. When double checking what they typed, they can't scroll or expand the box to see the full comment and/or to edit the comment before submitting it.

[#2]

I would add in the ability to tag users would be great here too!