fix for faq6.html (NFS examples)

In the old /etc/rc infrastructure, mountd was also started when
nfs_server was set to YES.  With the new rc.d, this is no longer
the case.  So mountd_flags needs to be set explicitly.

Also the default of "-tun4" is no longer in rc.conf, so I suppose we
should mention it in the FAQ.


Index: faq6.html
===================================================================
RCS file: /cvs/www/faq/faq6.html,v
retrieving revision 1.299
diff -u -r1.299 faq6.html
--- faq6.html   13 Aug 2012 01:43:25 -0000      1.299
+++ faq6.html   13 Aug 2012 19:39:58 -0000
@@ -1074,6 +1074,7 @@
 
 <blockquote><pre>
 portmap_flags=""
-nfsd_flags=""
+mountd_flags=""
+nfsd_flags="-tun4"
 </pre></blockquote>