Various documentation updates:
- update the tutorial
- update doc of deprecated cwise function
- update cwise doc snippets
diff --git a/doc/snippets/Cwise_cos.cpp b/doc/snippets/Cwise_cos.cpp
index 4eb230a..f589f07 100644
--- a/doc/snippets/Cwise_cos.cpp
+++ b/doc/snippets/Cwise_cos.cpp
@@ -1,2 +1,2 @@
-Vector3d v(M_PI, M_PI/2, M_PI/3);
-cout << v.cwise().cos() << endl;
+Array3d v(M_PI, M_PI/2, M_PI/3);
+cout << v.cos() << endl;