Trying to install using pkg, py36-feedparser-5.2.1 conflicts with py27-feedparser-5.2.1 on /usr/local/share/doc/feedparser/NEWS
It seems that package can be benefited with the use of USE_PYTHON=concurrent to generate prefixed DOCSDIR fixing this conflict.
This old PR this seems now to be solved. We have concurrent version of packages for textproc/feedparser:
$ pkg search feedparser
py27-feedparser-5.2.1 Universal feed parser written in Python
py37-feedparser-5.2.1 Universal feed parser written in Python
Thanks for your reporting. I'm closing the PR.