Improved I13_FunctionsTakingEigenTypes.dox.
Improved I13_FunctionsTakingEigenTypes.dox.

Removed the r-value reference part and focused on EIGEN_REF_TO_TEMPORARY only.

cjntaylor/eigen,pthulhu/eigen,cjntaylor/eigen,cjntaylor/eigen,pthulhu/eigen,pthulhu/eigen,pthulhu/eigen,cjntaylor/eigen,pthulhu/eigen