[Doc][bugfix] Example broke Ensemble>=WriteQuorum>=AckQuorum Rule

[dave2wave]

Motivation

Our admin examples must not show users incorrect information.

Modifications

Changed Bookkeeper persistence example.

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The binary protocol
• The REST endpoints
• The admin CLI options
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[merlimat]

We should add a check that rejects the invalid configuration

[dave2wave]

We should add a check that rejects the invalid configuration

There is a checkArgument if we set the policy through an admin call. Are you suggesting that we also test validity when a policy is created? This can be incomplete since the full check includes knowing the broker configuration to handle the currently allowed maximums for the ensemble size. I don't think testing without the max part is wrong, I'm just looking for clarification. In any case I think that check is a separate PR.

[Huanli-Meng]

LGTM

[Huanli-Meng]

@dave2wave could you please help confirm whether docs in other releases also need to be updated? Thanks.

[dave2wave]

@Huanli-Meng this change and #17955 need to be propagated to prior branches. Thank you.

[Huanli-Meng]

@Huanli-Meng this change and #17955 need to be propagated to prior branches. Thank you.

@dave2wave thanks for your confirmation. BTW, would you like to help update these updates to prior branches? Thanks