http://errors.yoctoproject.org/Errors/Details/56623/ http://errors.yoctoproject.org/Errors/Details/56624/
The tarball ships pre-compiled documentation so I'm not sure how this is failing for you unless you have another patch to modify the docs. That said there's a fix upstream, posting patch.
Here is the report and patch: https://bugs.launchpad.net/linaro-grub/+bug/1229982
Fixed in oe-core f59263a2d1a4918e8dd12fcf968a826b3e8fa018.