fix compilation of the doc and started a page dedicated to high performance and or BLAS users
diff --git a/doc/snippets/HouseholderQR_solve.cpp b/doc/snippets/HouseholderQR_solve.cpp
index aa94049..429bd81 100644
--- a/doc/snippets/HouseholderQR_solve.cpp
+++ b/doc/snippets/HouseholderQR_solve.cpp
@@ -4,6 +4,6 @@
cout << "Here is the matrix m:" << endl << m << endl;
cout << "Here is the matrix y:" << endl << y << endl;
Matrix3f x;
-m.householderQr().solve(y, &x));
+m.householderQr().solve(y, &x);
assert(y.isApprox(m*x));
cout << "Here is a solution x to the equation mx=y:" << endl << x << endl;