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document the remaining error-set members master

Every member of every public error set now carries a doc comment; CloseError's XapianException notes that the database has still been closed but changes may not have been flushed. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017i7R7ReKJAHGQpitxGXqrb