Major Description
There are a handful of client configs that can't be set by Streams users for various reasons, such as the group id, but we seem to have missed a few of them in the documentation here: the partitioner assignor (Consumer) and partitioner (Producer).
This section of the docs also just needs to be cleaned up in general as there is overlap between the Default Values and Parameters controlled by Kafka Streams sections, and the table of contents is messed up presumably due to an issue with the section headers.
We should separate these with one section covering (only) configs where Streams sets a different default but this can still be overridden by the user, and the other section covering the configs that Streams hardcodes and users can never override.