Document output data format version history and fix versioning links - #5378

Fixes #4868

What changed

• docs/source/explanation/scancode-versioning.rst: adds an "Output data format version history" section listing each output format version from 1.0.0 to 4.1.0, the release that shipped it and what changed. The history is based on the CHANGELOG and verified against the __output_format_version__ value in each tagged release (this also answers the question in the issue comments about where 3.2.0 was introduced: v32.2.0, with the is_direct / is_private / is_virtual additions).
• src/scancode_config.py: fixes two comments that link to .../misc/versioning.html, a page that does not exist. Both now point to the working versioning page at .../explanation/scancode-versioning.html.
• AUTHORS.rst: adds my name, per the contribution guidelines.

Tasks

• Reviewed contribution guidelines
• PR is descriptively titled and links the original issue above
• Tests pass (docs and comment changes only; CI will confirm)
• Commits are in a uniquely-named feature branch with no merge conflicts
• Updated documentation pages
• Updated CHANGELOG.rst (not applicable: documentation-only change, no API, CLI or behavior changes)

All commits are signed off per the DCO.