Revert "Revert "A few more comments on what to do""

This reverts commit 995dcaa1c2703e57c86faaa61288641c9fb8d202.
ProgrammingAssignment2 / cachematrix.R
Revert "ProgrammingAssignment2 / cachematrix.R"

This reverts commit b2eab6eaefba73ac32e8e7df990eccb9928ae23c.