Authz API fixes

[sstrigler]

Fixes EMQX-7870
Fixes EMQX-7981

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PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/ dir
• For EMQX 4.x: appup files updated (execute scripts/update-appup.sh emqx)
• For internal contributor: there is a jira ticket to track this change, and another jira tickt to track doc updates (if any)
• In case of non-backward compatible changes, reviewer should check this item as a write-off, and add details in Backward Compatibility section

Backward Compatibility

More information

[coveralls]

Pull Request Test Coverage Report for Build 3421638889

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 16 unchanged lines in 5 files lost coverage.
• Overall coverage increased (+0.1%) to 77.966%

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Files with Coverage Reduction	New Missed Lines	%
apps/emqx_gateway/src/emqx_gateway_schema.erl	1	90.0%
apps/emqx/src/emqx_authentication_config.erl	1	83.62%
apps/emqx/src/emqx_cm.erl	1	89.45%
apps/emqx/src/emqx_os_mon.erl	1	82.61%
apps/emqx/src/emqx_reason_codes.erl	12	89.71%

Totals
Change from base Build 3421617086:	0.1%
Covered Lines:	20870
Relevant Lines:	26768

---

💛 - Coveralls

[lafirest]

I think maybe this change is not necessary, the code is correct but the documentation is error, what we need is to update the doc

[zmstone]

I had the same question, but it actually turned out to be a schema error
https://github.com/emqx/emqx/pull/9299/files#r1016505227

[lafirest]

You can ignore the Chinese version, after you make a new PR you could send a message on slack to me, I'm glad to translate it