spec: unversioned doc directories in newer fedoras

Closes rhbz#993656.

Signed-off-by: Martin Milata <mmilata@redhat.com>
Merge pull request #719 from abrt/rhbz993656

spec: unversioned doc directories in newer fedoras

Closes rhbz#993656.

Signed-off-by: Martin Milata <mmilata@redhat.com>