/usr/lib/libkdevplatformdocumentation.so.8 is in kdevplatform8-libs 1.7.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libkdevplatformdocumentation.so.8.0.0
/usr/lib/libkdevplatformdocumentation.so.8.0.0