Various documentation updates:
- update the tutorial
- update doc of deprecated cwise function
- update cwise doc snippets
diff --git a/doc/snippets/Cwise_exp.cpp b/doc/snippets/Cwise_exp.cpp
index c22fd4c..db23618 100644
--- a/doc/snippets/Cwise_exp.cpp
+++ b/doc/snippets/Cwise_exp.cpp
@@ -1,2 +1,2 @@
-Vector3d v(1,2,3);
-cout << v.cwise().exp() << endl;
+Array3d v(1,2,3);
+cout << v.exp() << endl;