Fix some igor warnings:

- Indentations
- Replace spaces with tabs
- Fix a repeated word: it it -> it is

en_US.ISO8859-1/books/handbook/zfs/chapter.xml

@@ -2029,8 +2029,8 @@ mypool/var/tmp@my_recursive_snapshot           0      -   152K  -</screen>
 	  <command>zfs list</command>.  <option>-t all</option>
 	  displays both file systems and snapshots.</para>
 
-	<para>Snapshots are not mounted directly, so no path is shown in
-	  the <literal>MOUNTPOINT</literal> column.  There is no
+	<para>Snapshots are not mounted directly, so no path is shown
+	  in the <literal>MOUNTPOINT</literal> column.  There is no
 	  mention of available disk space in the
 	  <literal>AVAIL</literal> column, as snapshots cannot be
 	  written to after they are created.  Compare the snapshot
@@ -3565,7 +3565,7 @@ vfs.zfs.vdev.cache.size="5M"</programlisting>
 		      the pool unbootable.  Likewise, you should not
 		      use an entire disk as part of a mirror or
 		      <acronym>RAID-Z</acronym> vdev.  These are
-		      because it it impossible to reliably determine
+		      because it is impossible to reliably determine
 		      the size of an unpartitioned disk at boot time
 		      and because there's no place to put in boot
 		      code.</para>