[enterprise-4.10] Issue in file logging/cluster-logging-external.adoc #46565

GitHub issue: 

https://github.com/openshift/openshift-docs/issues/46565

*Note: When a PR is opened that fixes this issue, add to the PR description: "Fixes #12345" (replace 12345 with the GH issue number). This should automatically close the issue when the PR is merged. 

Which section(s) is the issue in?

Forwarding logs to external third-party logging systems

What needs fixing?

Please include documentation on how to configure a forwarding only scenario without the internal logging stack configured.