Yet again I've had to puzzle out the meaning of the pop-up Help text for Quiz 'Allow access from'. Here's a suggestion for better wording. I'm assuming this text is used in locations other than Quiz, otherwise I'd make additional changes.

Currently:
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Allow access from

Access from/to dates determine when students can access the activity via a link on the course page.

The difference between access from/to dates and availability settings for the activity is that outside the set dates the latter allows students to view the activity description, whereas access from/to dates prevent access completely.
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Suggested:
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Allow access from

Access from/to dates determine when students can access the activity via a link on the course page.

The difference between access from/to and availability settings for the activity is that outside the set dates, access from/to prevents access completely, while availability allows the students to view the activity description.
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Priority: Trivial