Problems with mbuf docs?

I'm just reading the mbuf docs (https://mynewt.apache.org/latest/os/core_os/mbuf/mbuf.html). I am still learning so I don't want to say these are errors and not my confusion - but if that's the case then maybe the docs could be expanded to head off these questions :-)

1. Regarding figure 1 (https://github.com/apache/mynewt-core/blob/master/docs/os/core_os/mbuf/pics/mbuf_fig1.png). The `Data Buffer` part of a `Packet Header mbuf` must be `MBLEN - 24 - N` bytes and not just `MBLEN - 16`?

2. In the example code at the end (https://mynewt.apache.org/latest/os/core_os/mbuf/mbuf.html#using-mqueue is the closest link I can get) the call to `os_mqueue_init` has only two parameters when the docs further down say it should have three. I'm guessing the second parameter should be `process_rx_data_queue`. If not can the docs be expanded to explain how `process_rx_data_queue` does get called?

Read the mbuf documentation at docs/os/core_os/mbuf/mbuf.html and inspect the referenced figure at docs/os/core_os/mbuf/pics/mbuf_fig1.png. Check the os_mqueue_init example against its documented parameters, including process_rx_data_queue, and verify the Data Buffer sizing. Done means the diagram and example are corrected or the questions are explicitly explained.

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