Sync 4.12.0 autorecovery doc to lastest
Sync 4.12.0 autorecovery doc to lastest

Descriptions of the changes in this PR:

Copying documentation updates for auto recovery from the `4.12.0` directory to the `latest` directory based on eolivelli's request in https://github.com/apache/bookkeeper/pull/2507.

Reviewers: Enrico Olivelli <eolivelli@gmail.com>

This closes #2516 from michaeljmarshall/update-latest-documentation
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