Updating HAProxy snapshot documentation v1.5-dev26-21 generated by haproxy-dconv v0.3.1-19

18bf01e MEDIUM: tcp: add a new tcp-request capture directive
d9ed3d2 MINOR: logs: don't limit HTTP header captures to HTTP frontends
4bf9963 MINOR: log: allow the HTTP status code to be logged even in TCP frontends
be722a2 DOC: fix remaining occurrences of "pattern extraction"