Documentation review for "Remove cleaned up OIDs from database and cache"

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References

Merged MR that introduced documentation requiring review: gitlab-ce!26555

Related issue(s): https://gitlab.com/gitlab-org/gitlab-ce/issues/30093

Further Details

The following discussion from gitlab-ce!26555 should be addressed:

• @nick.thomas started a discussion:

  @marcia we could do with a documentation review here, I think.

  This feature started as repository size reduction, but with these changes we're starting to inch it towards removing sensitive content from history.

  It's still not complete, and there are lots of places where we need to address copies of the rewritten data before it will be, but it feels like the docs are starting to creak!

  I did find https://docs.gitlab.com/ee/topics/git/numerous_undo_possibilities_in_git/ which mentions BFG and git filter-branch, but I'm concerned that this doesn't seem GitLab-specific at present.

  WDYT? Can we merge as-is and look at a follow-up issue to split the topics, or should we address this upfront?