Haproxy: Documentation (v1.9+) needs to be updated

[monteiz]

Hi everybody,
the first chapter of the official documentation needs to be updated, as from HAProxy v.1.9 it became possible to forward HTTP/2 requests to other servers.

Specifically, as @lukastribus confirms, this is the paragraph that should be updated:

For HTTP/2, the connection mode resembles more the "server close" mode : given
the independence of all streams, there is currently no place to hook the idle
server connection after a response, so it is closed after the response. HTTP/2
is only supported for incoming connections, not on connections going to
servers.

[wtarreau]

Yes, and I have in my todo list to finish to lift up such docs for the 2.2 release. We've been significantly delayed by painful bugs, and I think some docs will be updated post-release and backported. But this example is a perfect one and it must be fixed.

Thanks for spotting it!

[monteiz]

@wtarreau Very glad to contribute to this fantastic project!

If I may give a suggestion, I would migrate the documentation from .txt files to markdown format (.md files). That would incredibly improve the readability of the documents.

[wtarreau]

Doc was updated in 2.2 and now backported as far as 1.9. Closing.