zfs.8 has wrong description of "zfs program -t"

The "-t" argument to "zfs program" specifies a limit on the number of
LUA instructions that can be executed.  The zfs.8 manpage has the wrong
description.  It should be updated to match what's in zfs-program.8

Also fix the formatting of the zfs help message.

Reviewed by: Allan Jude <[email protected]>
Reviewed-by: loli10K <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Matthew Ahrens <[email protected]>
Closes #8410 

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