Document httpd parameter: -C certchain

Reference: /n/sources/patch/applied/httpdcertchainman
Date: Wed Jun  4 23:22:27 CES 2008
Signed-off-by: davide+p9@cs.cmu.edu

--- /sys/man/8/httpd	Wed Jun  4 23:21:24 2008
+++ /sys/man/8/httpd	Wed Jun  4 23:21:24 2008
@@ -7,7 +7,9 @@
 .RB [ -a
 .IR srvaddr ]
 .RB [ -c
-.IR cert ]
+.I cert
+.RB [ -C
+.IR certchain ]]
 .RB [ -d
 .IR domain ]
 .RB [ -n
@@ -103,6 +105,11 @@
 .BR tcp!*!https .
 There should already be a factotum
 holding the corresponding private key.
+If the specified certificate has been signed
+by a certificate authority, the
+.B -C
+option may be used to specify a file
+containing a chain of signed certificates.
 .PP
 .I Httpd
 supports only the GET and HEAD methods of the HTTP protocol;