Add make target "docs" to create current branch

We've been seeing issues with sphinx-multiversion not building the
docs with the imported repos. sphinx-build still works as expected,
and we don't have a very strong need for multiversion builds.

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: Iab726bb365970a58746204980b21d595232204ba
3 files changed