Clarify OAuth issuer checking documentation

[won-seoop]

Type of change

Documentation

Description

Clarifies the OAuth server-side configuration documentation for issuer checking.

When oauth.check.issuer="false" is used, oauth.valid.issuer.uri should not be configured. If oauth.valid.issuer.uri is configured, the issuer is checked against that value.

Closes #12453

Checklist

• Write tests (N/A - documentation only)
• Make sure all tests pass (make docu_check)
• Update documentation
• Check RBAC rights for Kubernetes / OpenShift roles (N/A - documentation only)
• Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally (N/A - documentation only)
• Reference relevant issue(s) and close them after merging
• Update CHANGELOG.md (N/A - documentation only)
• Supply screenshots for visual changes, such as Grafana dashboards (N/A - documentation only)

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[scholzj]

Thanks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.18%. Comparing base (151b17d) to head (e971315).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12776      +/-   ##
============================================
+ Coverage     75.16%   75.18%   +0.01%     
- Complexity     6458     6459       +1     
============================================
  Files           346      346              
  Lines         24329    24329              
  Branches       3120     3120              
============================================
+ Hits          18287    18291       +4     
+ Misses         4808     4803       -5     
- Partials       1234     1235       +1     

see 2 files with indirect coverage changes

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