Various documentation updates:
- update the tutorial
- update doc of deprecated cwise function
- update cwise doc snippets
diff --git a/doc/snippets/Cwise_square.cpp b/doc/snippets/Cwise_square.cpp
index 9ed41c2..f704c5e 100644
--- a/doc/snippets/Cwise_square.cpp
+++ b/doc/snippets/Cwise_square.cpp
@@ -1,2 +1,2 @@
-Vector3d v(2,3,4);
-cout << v.cwise().square() << endl;
+Array3d v(2,3,4);
+cout << v.square() << endl;