Add missing className in documentation

[stumbaumr]

The parameter className ist missing here...

[Haarolean]

let me know if that's not the case

[Haarolean]

This shouldn't be needed as proto is a built-in serde, given the name stays as is, no classname should be specified (io/kafbat/ui/serdes/SerdesInitializer.java:44)

[stumbaumr]

You are correct. At first I used custom names, then was wondering why it did not work and then read the comment in the source code and changed the name accordingly.
Maybe cut&paste the comment from the source code into the documentation or at least link to it.
Took me some time to get past this configuration error.

[Haarolean]

You are correct. At first I used custom names, then was wondering why it did not work and then read the comment in the source code and changed the name accordingly. Maybe cut&paste the comment from the source code into the documentation or at least link to it. Took me some time to get past this configuration error.

could you leave a comment then? Like
className: io.kafbat.ui.serdes.builtin.ProtobufFileSerde # not needed unless a custom name is used