* Merge Extract and Part to the Part expression.
Renamed "MatrixBase::extract() const" to "MatrixBase::part() const"
* Renamed static functions identity, zero, ones, random with an upper case
first letter: Identity, Zero, Ones and Random.
diff --git a/doc/snippets/MatrixBase_zero.cpp b/doc/snippets/MatrixBase_zero.cpp
index 8b4af04..6064936 100644
--- a/doc/snippets/MatrixBase_zero.cpp
+++ b/doc/snippets/MatrixBase_zero.cpp
@@ -1,2 +1,2 @@
-cout << Matrix2d::zero() << endl;
-cout << RowVector4i::zero() << endl;
+cout << Matrix2d::Zero() << endl;
+cout << RowVector4i::Zero() << endl;