Clarify that Quorum is measured when tallying the votes

[dzacharo]

It is not clear from the Bylaws that the Quorum is measured by checking voting participants after the voting period is over and when the Chair is tallying the votes. Some clarification language would be helpful for accuracy.

[BenWilson-Mozilla]

Additional language for determining quorum should be added to item 7 in section 2.3. According to Martijn and the member tool, we're calculating quorum after the voting period is over. So we should clarify this in the Bylaws so that it is consistent with the member tool.