Add parameters descriptions to documentation

docs: fix simple typo, priorty -> priority

There is a small typo in examples/stm32-freertos-tcp/stm32f7/core_cm7.h.

Should read `priority` rather than `priorty`.

Fix #1340: Long HTTP Chunks

Due to a copy/paste error, the start of the payload in the latest parsed
chunk was compared to chunk-length of the terminating chunk (5 chars).
So only chunks were parsed as expected, which also had a single hex
digit length.

This test would have caught #1340: handling chunks longer than 15 chars