add snippet for sub/super diagonal

fix a few doc issues

2 files changed, 7 insertions, 2 deletions

diff --git a/doc/C03_TutorialGeometry.dox b/doc/C03_TutorialGeometry.dox
index b3c860d53..2d3d742c9 100644
--- a/doc/C03_TutorialGeometry.dox
+++ b/doc/C03_TutorialGeometry.dox
@@ -10,7 +10,7 @@ namespace Eigen {
   | \ref TutorialSparse "Sparse matrix"
 </div>
 
-In this tutorial chapter we will shortly introduce the many possibilities offered by the \ref GeometryModule "geometry module",
+In this tutorial chapter we will shortly introduce the many possibilities offered by the \ref Geometry_Module "geometry module",
 namely 2D and 3D rotations and affine transformations.
 
 \b Table \b of \b contents
@@ -106,7 +106,7 @@ Transform3f m = Translation3f(..);  Transform3f m = Matrix3f(..);
 
 <a href="#" class="top">top</a>\section TutorialGeoCommontransformationAPI Common API across transformation types
 
-To some extent, Eigen's \ref GeometryModule "geometry module" allows you to write
+To some extent, Eigen's \ref Geometry_Module "geometry module" allows you to write
 generic algorithms working on any kind of transformation representations:
 <table class="tutorial_code">
 <tr><td>
diff --git a/doc/snippets/MatrixBase_diagonal_int.cpp b/doc/snippets/MatrixBase_diagonal_int.cpp
new file mode 100644
index 000000000..0e73d1c16
--- /dev/null
+++ b/doc/snippets/MatrixBase_diagonal_int.cpp
@@ -0,0 +1,5 @@
+Matrix4i m = Matrix4i::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here are the coefficients on the 1st super-diagonal and 2nd sub-diagonal of m:" << endl
+     << m.diagonal<1>().transpose() << endl
+     << m.diagonal<-2>().transpose() << endl;