Various documentation updates:
- update the tutorial
- update doc of deprecated cwise function
- update cwise doc snippets
diff --git a/doc/snippets/Cwise_less.cpp b/doc/snippets/Cwise_less.cpp
index 008e3d9..cafd3b6 100644
--- a/doc/snippets/Cwise_less.cpp
+++ b/doc/snippets/Cwise_less.cpp
@@ -1,2 +1,2 @@
-Vector3d v(1,2,3), w(3,2,1);
-cout << (v.cwise()<w) << endl;
+Array3d v(1,2,3), w(3,2,1);
+cout << (v<w) << endl;