Revert "A few more comments on what to do"

This reverts commit e4eed4153bd237a2dd4532fc3f40ce0e22fd0cb7.
caching the inverse of a matrix

makeCacheMatrix: This function creates a special "matrix" object that
can cache its inverse.
cacheSolve: This function computes the inverse of the special "matrix"
returned by makeCacheMatrix above. If the inverse has already been
calculated (and the matrix has not changed), then the cachesolve should
retrieve the inverse from the cache.