Update kafkaErrors.adoc

[georgeharley]

Existing doc on error handling strategies states that using RETRY_ON_ERROR will retry consuming events indefinitely. That does not seem to square with the source of the @ErrorStrategy annotation where the default behaviour is that only a single retry is attempted unless the retryCount property is set to some other value.

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[timyates]

Thanks @georgeharley you're right!

I've superseded this with https://github.com/micronaut-projects/micronaut-kafka/pull/605 which also fixes the javadoc for DEFAULT_RETRY_COUNT

Thanks again for the contribution 👍