[ANN] Specification update

[Stephane Bortzmeyer]

On Mon, Nov 08, 2021 at 05:14:18PM +0100,
 Philip Linde <linde.philip at gmail.com> wrote 
 a message of 35 lines which said:

> I wonder how hard it would be to automatically identify server
> software that doesn't implement this properly. Probably some server
> software could be differentiated based on their error code
> descriptions or how they deal with some corner cases.

Yes, fingerprinting servers is certainly possible. Someone to take
this project?

Note that some servers send the TLS proper close for "normal" replies
but fail to do so when there is an error, such as 51. It helps with
fingerprinting, though.