align zfs_autoimport_disable manpage with reality

The default was changed in #2820.

Signed-off-by: cburroughs <chris.burroughs@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3341

man/man5/zfs-module-parameters.5

@@ -488,7 +488,7 @@ Default value: \fB5\fR.
 .RS 12n
 Disable pool import at module load by ignoring the cache file (typically \fB/etc/zfs/zpool.cache\fR).
 .sp
-Use \fB1\fR for yes and \fB0\fR for no (default).
+Use \fB1\fR for yes (default) and \fB0\fR for no.
 .RE
 
 .sp