This fixes #1513594, but not #1515417.

# rpm -q redis
redis-4.0.5-1.fc27.x86_64
# rpm -qf /usr/share/doc/redis/
file /usr/share/doc/redis is not owned by any package

The /usr/share/doc/redis directory, and all the file in it are owned by the redis-doc packages.

$ rpm -qlp /tmp/redis-4.0.5-1.fc26.x86_64.rpm | grep share/doc
$ rpm -qlp /tmp/redis-doc-4.0.5-1.fc26.noarch.rpm | head -n 1
/usr/share/doc/redis

The problem is reproducible if you update from the current stable redis package.

# rpm -q redis
redis-4.0.2-2.fc26.x86_64
# dnf -qy --enablerepo updates-testing update redis
# rpm -q redis
redis-4.0.5-1.fc26.x86_64
# rpm -qf /usr/share/doc/redis
file /usr/share/doc/redis is not owned by any package

After digging deeper, I realize actual problem is redis-4.0.2-2 creates /usr/share/doc/redis but doesn't remove it when uninstalled (because it doesn't own it). So this update fixes the problem going forward, but not for those that are updating and don't have redis-doc installed. Yall may not care, but I just wanted to bring it up.