Add docs for https://github.com/vitessio/vitess/pull/13056

[austenLacy]

Adds docs for the --schema-version-max-age-seconds vttablet flag added in https://github.com/vitessio/vitess/pull/13056.

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[mattlord]

Thanks! Now just need to address the DCO failure and we're good! :) https://github.com/vitessio/website/pull/1475/checks?check_run_id=13617586365