Remove doc/snippets/MatrixBase_minor.cpp because minor() was removed.
Remove doc/snippets/MatrixBase_minor.cpp because minor() was removed.

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