Removed :codeauthor: field lists from logging handler docs

Fixes #7692

There is a conflict between author field list fields in rST and the
regular PDF metadata. If there is a workaround for this, I'd love to
know it but I'm pulling this out for now so the PDF will build. Besides,
who is Pedro Alonso and why is he claiming ownership of our modules?
Merge pull request #7893 from whiteinge/codeauthor-pdf-conflict

Removed :codeauthor: field lists from logging handler docs