Correct man page generation

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: bunder2015 <omfgbunder@gmail.com>
Closes #6409
Closes #6410

man/man8/Makefile.am

@@ -4,7 +4,7 @@ dist_man_MANS = \
 	vdev_id.8 \
 	zdb.8 \
 	zfs.8 \
-	zgenhostid.8
+	zgenhostid.8 \
 	zinject.8 \
 	zpool.8 \
 	zstreamdump.8