Add content supporting specification projects to the handbook

Submitted by Wayne Beaton @wbeaton

Link to original bug (#552040)

Description

For example...

For release reviews, specification projects require a ballot of the specification committee. My current thinking is that the EMO will request that the specification committee initiate the ballot.

Project teams should also anticipate the extra time required to complete the release review. Ballots require a minimum of two weeks and may be extended to 30 days.