docs/162419: document (new) zfs and zpool cmdline options

[Johannes Totz]

>Number:         162419
>Category:       docs
>Synopsis:       document (new) zfs and zpool cmdline options
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-doc
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          doc-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Nov 10 00:20:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Johannes Totz
>Release:        
>Organization:
>Environment:
just checked manpages on head in svn
>Description:
Please update manpages for zfs and zpool to include to new command line options that sneaked in with a previous import:
- zfs diff
- zpool import -F -X

Esp what does -F and -X do for import? Discard the most recent txg?
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: