Kafka plugin is missing in the input section

[mgrzybek]

Describe the bug

The document at https://docs.fluentd.org/input only talks about Kafka as an output module.

Link to the problematic documentation

https://docs.fluentd.org/input

Expected explanation

https://github.com/fluent/fluent-plugin-kafka provides both an input and an output feature.
I wish I could find Kafka as an input module in the documentation.

Additional context

No response