📚 Update ScheduledScan API Documentation

[rseedorff]

📚 Documentation Issue

Describe the issue

The ScheduledScan API documentation is a bit out of date and needs an update.

Suggested change

Some of the latest features are not present and documented there:

• ➹ Introduce a concurrency policy option for scheduledScan CRD #275 (implemented by Added a concurrency policy option for scheduledScan CRD #1749)
• ➹ Add a crontab configuration option to scheduledScans #150 (implemented by Added a crontab configuration option to scheduledScans #1722)
• Let AutoDiscovery create ScheduledScans with RetriggerOnScanTypeChange enabled #748 RetriggerOnScanTypeChange