Add missing .El to xinstall.1
diff --git a/xinstall.1 b/xinstall.1
index 39efee1..1a727d3 100644
--- a/xinstall.1
+++ b/xinstall.1
@@ -74,6 +74,7 @@
 .Fl m
 is used to select another mode. When the symbolic
 notation is used, the base mode is 0000.
+.El
 .Sh SEE ALSO
 .Xr chmod 1 ,
 .Xr chown 1 ,