Reverting "Spec: use %license instead of %doc for license files"

This reverts commit 1710295e2c812b10c563efbb9f57fa627013a777.

Revert "Spec: use %license instead of %doc for license files"

This reverts commit 1710295e2c812b10c563efbb9f57fa627013a777.
Let's wait with this until it is supported by fedora-review.
See rfe https://bugzilla.redhat.com/show_bug.cgi?id=1127916