This tool is given the following inputs:

- a Git commit and corresponding .build-manifest (from a build from
  that commit) representing the "old" state

- another Git commit and .build-manifest representing the "old" state

- a database of metadata that describes the relationship of which
  source changes impacts which documentation pages

and it will list documentation pages that are potentially impacted by
changes in the source files or packages we install, and thus should be
investigated whether they need to be updated.

Will-fix: #14579