Various documentation updates:
- update the tutorial
- update doc of deprecated cwise function
- update cwise doc snippets
diff --git a/doc/snippets/Cwise_pow.cpp b/doc/snippets/Cwise_pow.cpp
index 6a58ddf..a723ed8 100644
--- a/doc/snippets/Cwise_pow.cpp
+++ b/doc/snippets/Cwise_pow.cpp
@@ -1,2 +1,2 @@
-Vector3d v(8,27,64);
-cout << v.cwise().pow(0.333333) << endl;
+Array3d v(8,27,64);
+cout << v.pow(0.333333) << endl;