Documentation: Fix examples and clarify Eigen API notes

libeigen/eigen!2652

Closes #998, #2142, #301, #1822, #1959, #805, #462, #308, #2146, #1335, #634, #81, and #46

doc/examples/TutorialLinAlgSVDSolve.cpp

@@ -10,5 +10,5 @@ int main() {
   Eigen::VectorXf b = Eigen::VectorXf::Random(3);
   std::cout << "Here is the right hand side b:\n" << b << std::endl;
   std::cout << "The least-squares solution is:\n"
-            << A.bdcSvd(Eigen::ComputeThinU | Eigen::ComputeThinV).solve(b) << std::endl;
+            << A.bdcSvd<Eigen::ComputeThinU | Eigen::ComputeThinV>().solve(b) << std::endl;
 }