Properly document OMF options for OmfEc::Backward::AppDefinition

refs: #1168 @1h
refs: #1159

Signed-off-by: Olivier Mehani <olivier.mehani@nicta.com.au>
Properly document oml2-scaffold options for OmfEc::Backward::AppDefinition

fixes: #1168 @1h
refs: #1159

Signed-off-by: Olivier Mehani <olivier.mehani@nicta.com.au>