Using fully resolved links (to the master branch) in markdown files is problematic, because:
- When the target file is (re)moved, such a link will be a 404
- When reading docs for a previous commit/release, one is redirected to the master branch on such a link
- When the target file has been updated, it may no longer apply to the commit/release one came from (changed options, etc)
Fix all issues by using relative markdown links. Note that this only works in markdown. Also, release notes are left as-is, because they will be shared stand-alone externally, so can’t use relative links.