Issue: [4.1 Alpha 3] Admin cp: Custom BBcode CSS Class White-List field/explain discrepancy

I have the [div] bbcode open in the admin cp. In the "Wiki-Related Options" section is a field for white-listed CSS classes.

This field is a single-line textbox. The associated explain phrases says "Custom CSS class names that users can use to style this tag's output. Place each class on a separate line."

It is not possible to do this with a regular single-line textbox. Either this field will need to be a multi-line textbox (specify rows in the field format parameters), or the explanation phrase will need tweaking to specify another delimiter (e.g. comma).