- Renamed the page to "Module Parameter" since it now applies
equally to Linux and FreeBSD.
- Updated spl_kmem_cache_expire, spl_kmem_cache_obj_per_slab_min,
spl_kmem_cache_kmem_limit to note the last version they were
included in.
- Added new l2arc_mfuonly, l2arc_rebuild_blocks_min_l2size,
l2arc_rebuild_enabled, and l2arc_trim_ahead options which
were added in OpenZFS 2.0 for the persistent L2ARC feature.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>