et up `fitControl` so that vanilla 5-fold crossvalidation is being used to estimate the generalization error, then provide estimates of the generalization error of a * Vanilla linear regression model * Regularized linear regression model tuned over values of `alpha` of 0, 0.2, 0.4, 0.6, 0.8, 1 and values of `lambda` of 10 raised to the -3, -2.5, -2, ..., -1, -0.5 powers