[Website]: Documentation page in 9.x still uses container input type for K8s

[lucabelluccini]

Type of issue

Inaccurate

What documentation page is affected

https://www.elastic.co/docs/reference/beats/filebeat/running-on-kubernetes

What happened?

In the page, at https://www.elastic.co/docs/reference/beats/filebeat/running-on-kubernetes#_parsing_json_logs, we still suggest using container input type (deprecated in 9.x).

We should provide examples using the filestream input type.

Additional info

No response

[vishaangelova]

Closing this as it is a duplicate of #1738