fix(SetupChecks): Link to task processing worker docs

[marcelklehr]

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[marcelklehr]

/backport to stable34

[marcelklehr]

/backport to stable33

[marcelklehr]

/backport to stable32

[marcelklehr]

Moar reviews 💪

[nickvergessen]

Failing CI related:

There were 2 errors:

1) OCA\Settings\Tests\TaskProcessingWorkerIsRunningTest::testPass
ArgumentCountError: Too few arguments to function OCA\Settings\SetupChecks\TaskProcessingWorkerIsRunning::__construct(), 4 passed in /home/runner/actions-runner/_work/server/server/apps/settings/tests/SetupChecks/TaskProcessingWorkerIsRunningTest.php on line 38 and exactly 5 expected

/home/runner/actions-runner/_work/server/server/apps/settings/lib/SetupChecks/TaskProcessingWorkerIsRunning.php:25
/home/runner/actions-runner/_work/server/server/apps/settings/tests/SetupChecks/TaskProcessingWorkerIsRunningTest.php:38

2) OCA\Settings\Tests\TaskProcessingWorkerIsRunningTest::testFail
ArgumentCountError: Too few arguments to function OCA\Settings\SetupChecks\TaskProcessingWorkerIsRunning::__construct(), 4 passed in /home/runner/actions-runner/_work/server/server/apps/settings/tests/SetupChecks/TaskProcessingWorkerIsRunningTest.php on line 38 and exactly 5 expected

/home/runner/actions-runner/_work/server/server/apps/settings/lib/SetupChecks/TaskProcessingWorkerIsRunning.php:25
/home/runner/actions-runner/_work/server/server/apps/settings/tests/SetupChecks/TaskProcessingWorkerIsRunningTest.php:38

[marcelklehr]

Fixed