a11y: use multiline message bars for errors #2388
Merged
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Description
This changes the BaseEditor component slightly, letting its error messages be multiline as well as changing the format of the "Refer to docs" link to better resemble the examples in the Fabric UI component demo. This obviates the problem in #2114 by removing the need to collapse the message bar in the first place.
Task Item
Closes #2114
Screenshots