Moritz Angermann authored Feb 28, 2017 and Ben Gamari committed Feb 28, 2017

After falling over the CreateBCOs message, and expecting it to contain
ByteStrings encoding `ResolvedBCO`s instead of `[ResolvedBCO]`s, when
deubbing issues with iserv, I'd like to extend the documentation here
a bit, so the next one won't fall over it.

Reviewers: simonmar, austin, rwbarton, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D3234