stats: Reference zpool-iostat(8) instead of zpool(8)

MFC after:	3 days

share/man/man7/stats.7

@@ -24,7 +24,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd May 7, 2026
+.Dd June 9, 2026
 .Dt STATS 7
 .Os
 .Sh NAME
@@ -116,7 +116,7 @@ Report ZFS I/O statistics
 .Xr pmcstat 8 ,
 .Xr pstat 8 ,
 .Xr vmstat 8 ,
-.Xr zpool 8
+.Xr zpool-iostat 8
 .Sh HISTORY
 The
 .Nm