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Update HTML documentation from man pages

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doc/html/man5/3proxy.cfg.5.html
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@ -825,6 +825,26 @@ the external address for this request to <i>&lt;ip&gt;</i>.
It can be chained with another parent type. It&rsquo;s
useful to set the external IP based on ACL or make it
random. <b><br>
extport</b> does not redirect the request; it sets the range
the local port of outgoing connections is taken from, given
as <i>FIRST-LAST</i> inclusive in place of the port
argument, with 0.0.0.0 as the address, for example <b>parent
1000 extport 0.0.0.0 40000-40100</b>. Where the system can
be asked to pick the port itself (Linux
<b>IP_LOCAL_PORT_RANGE</b>) it does, otherwise a port is
picked at random from the range and retried if it is already
in use, up to ten times. It can be chained with another
parent type, and the access rule it belongs to decides which
requests it applies to, so <b>allow * * * * UDPASSOC</b>
followed by <b>parent 1000 extport 0.0.0.0 40000-40100</b>
limits it to UDP associations. The range is applied when the
outgoing connection is made, so a kept alive connection
carrying several requests uses the rule that matched when it
was opened. <b><br>
intport</b> is the same for sockets bound on the side facing
the client: the port a UDP association tells the client to
send its datagrams to, and the FTP proxy data connection.
<b><br>
tcp</b> simply redirect connection. TCP is always last in
chain. This type of proxy is a simple TCP redirection, it
does not support parent authentication. <b><br>