Fix a few rst formatting errors in the docs so
sphinx does not generate warnings.
Change-Id: I000d2ca3961678b47ead7a7885f3bc88ed7babc7
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
Update devref to explain the new definition of host aggregates.
part of blueprint general-host-aggregates
Change-Id: I5d46c4c4253a4d9e74a52192d1e6244843d11711