Update info on deep dives at Board meetings to make the time limits clearer

Why is this change being made?

This was a question that came up and this makes it clearer

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what