Improve UI and documentation for "Ignore Attributes" in Owners slightly
Summary:
See PHI251. Ref T13137.
- Replace the perplexing text box with a checkbox that explains what it does.
- Mention this feature in the documentation.
Test Plan:
- Clicked/unclicked checkbox.
- Read documentation.
- Used an existing checkbox control in Slowvote to make sure I didn't break it.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13137
Differential Revision: https://secure.phabricator.com/D19433