[Bug]Documentation contains Information of unimplemented feature `Export Report`

### Documentation links
https://www.elastic.co/docs/solutions/security/get-started/siem-readiness#siem-readiness-export

### Description

**Actual **
The `Export report` feature is not implemented yet but the Elastic docs contains the information.
Please refer [comment](https://github.com/elastic/kibana/issues/269104#issuecomment-4444292680) on [#269104](https://github.com/elastic/kibana/issues/269104)

**Expected **
Remove `Export report` feature details from Elastic documentation as functionality is not yet implemented

### Which documentation set(s) does this bug apply to?

ESS only

### Release version
This bug applies to Elastic Stack 9.4.0 releases

### Testing environment

Build deployed from the production cloud environment: https://cloud.elastic.co/