DOC: clarify the handling of URL fragments in requests

DOC: clarify the handling of URL fragments in requests

Origin: https://git.haproxy.org/?p=haproxy-2.6.git;a=commit;h=c47814a58ec153a526e8e9e822cda6e66cef5cc2

We indicate in path/pathq/url that they may contain '#' if the frontend
is configured with "option accept-invalid-http-request", and that option
mentions the fragment as well.

(cherry picked from commit 7ab4949ef107a7088777f954de800fe8cf727796)
 [ad: backported as a companion to BUG/MINOR: h1: do not accept '#' as
  part of the URI component]
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
(cherry picked from commit 965fb74eb180ab4f275ef907e018128e7eee0e69)
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
(cherry picked from commit e9903d6073ce9ff0ed8b304700e9d2b435ed8050)
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
Gbp-Pq: Name DOC-clarify-the-handling-of-URL-fragments-in-request.patch