message: Fix a couple of typos and also indentation
diff: @@ -198,7 +198,7 @@ $$
  f(1) \\
  f(\omega) \\
  \vdots \\
  - f(\omega_{n - 1})
  + f(\omega^{n - 1})
  \end{bmatrix}
  $$
  All we need now is the inverse of this matrix, which is slightly complicated to compute. I'm going to skip it for now, but if you have the details please make a pull request.
  @@ -224,7 +224,7 @@ $$
  f(1) \\
  f(\omega) \\
  \vdots \\
  - f(\omega_{n - 1})
  + f(\omega^{n - 1})
  \end{bmatrix}
  $$
  Observe that this equation is nearly identical to the original equation for evaluation, execept with the following substitution.
  