Fixes [YOCTO #2459]
I provided better definitions to the -dev and -sdk image types.
They now call out host development and target development.
(From yocto-docs rev: bd2c0db27d7eb038931550a96752f961ea6b1d9c)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>