BUG/MINOR: quic: fix documentation for transport params decoding
The documentation for functions related to transport parameters decoding
is unclear or sometimes completely wrong on the meaning of the <server>
argument. It must be set to reflect the origin of the parameters,
contrary to what was implied in function comments.
Fix this by rewriting comments related to this <server> argument. This
should prevent to make any mistake in the future.
This is purely a documentation fix. However, it could be useful to
backport it up to 2.6.