Make use of "i.e." (id est) consistent

This is the most common way it is written throughout the manpages, but
there are a few cases where it is written slightly differently.

Signed-off-by: Simon Howard <fraggle@gmail.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>

man/man4/spl.4

@@ -111,7 +111,7 @@ For this reason,
 can be used to set a maximum magazine size.
 When this value is set to 0 the magazine size will
 be automatically determined based on the object size.
-Otherwise magazines will be limited to 2-256 objects per magazine (i.e per cpu).
+Otherwise magazines will be limited to 2-256 objects per magazine (i.e. per CPU).
 Magazines may never be entirely disabled in this implementation.
 .
 .It Sy spl_hostid Ns = Ns Sy 0 Pq ulong

man/man4/zfs.4

@@ -152,7 +152,7 @@ transition to MRU, in which case the
 Setting it to 1 means to L2 cache only MFU data and metadata.
 .Pp
 Setting it to 2 means to L2 cache all metadata (MRU+MFU) but
-only MFU data (ie: MRU data are not cached). This can be the right setting
+only MFU data (i.e. MRU data are not cached). This can be the right setting
 to cache as much metadata as possible even when having high data turnover.
 .Pp
 Regardless of

man/man7/zpool-features.7

@@ -583,7 +583,7 @@ dedup tables.
 This feature will be
 .Sy active
 when the first deduplicated block is written after a new dedup table is created
-(ie after a new pool creation, or new checksum used on a dataset with
+(i.e. after a new pool creation, or new checksum used on a dataset with
 .Sy dedup
 enabled).
 It will be returned to the