mocks/consumer.go missing some documentation.

[emilienkofman]

Thank you for the great work. I was writing tests using the library and saw there's some documentation missing (minor issue). Hope it's the right place to report that.

Versions

sarama library v1.37.2

Problem Description

There's apparently some documentation missing from mocks/consumer.go, see
https://github.com/Shopify/sarama/blob/main/mocks/consumer.go#L208

[github-actions]

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