Correct an erroneous statement in \crossref{transactions} that claimed transaction IDs are not part of the consensus protocol.
Correct an erroneous statement in \crossref{transactions} that claimed transaction IDs are not part
of the consensus protocol.

Signed-off-by: Daira Hopwood <cd7d43d5556a38ce626d53826fddc46adc597539@jacaranda.org>

zcash/zips,zcash/zips,zcash/zips,zcash/zips