API v2 updates for attrib, group, jig [1/1]

Updated attrib.md formatting, added draft group and jig docs


 doc/devguide/api/attrib.md |  214 ++++++++++++++++++++++++--------------------
 doc/devguide/api/group.md  |   99 ++++++++++++++++++++
 doc/devguide/api/jig.md    |  107 ++++++++++++++++++++++
 3 files changed, 325 insertions(+), 95 deletions(-)

Crowbar-Pull-ID: e3292ef2ba47af1b0b51860a620df5bf9eb500dd

Crowbar-Release: development