Various documentation updates:
- update the tutorial
- update doc of deprecated cwise function
- update cwise doc snippets
diff --git a/doc/snippets/Cwise_cube.cpp b/doc/snippets/Cwise_cube.cpp
index fd40436..85e41dc 100644
--- a/doc/snippets/Cwise_cube.cpp
+++ b/doc/snippets/Cwise_cube.cpp
@@ -1,2 +1,2 @@
-Vector3d v(2,3,4);
-cout << v.cwise().cube() << endl;
+Array3d v(2,3,4);
+cout << v.cube() << endl;