Various documentation updates:
- update the tutorial
- update doc of deprecated cwise function
- update cwise doc snippets
diff --git a/doc/snippets/MatrixBase_colwise.cpp b/doc/snippets/MatrixBase_colwise.cpp
index c8b380c..a048bef 100644
--- a/doc/snippets/MatrixBase_colwise.cpp
+++ b/doc/snippets/MatrixBase_colwise.cpp
@@ -2,4 +2,4 @@
 cout << "Here is the matrix m:" << endl << m << endl;
 cout << "Here is the sum of each column:" << endl << m.colwise().sum() << endl;
 cout << "Here is the maximum absolute value of each column:"
-     << endl << m.cwise().abs().colwise().maxCoeff() << endl;
+     << endl << m.cwiseAbs().colwise().maxCoeff() << endl;