fix a couple of typos

[chad3814]

• on the homepage it says be instead of by
• on the 'Higher Order Functions' page it says

  Let's answer us this question: How many elements does it take for the sum of the roots of all natural numbers to exceed 1000? To get the squares of all natural numbers, we just do map sqrt [1..].

  • That should be To get the square roots of all natural numbers

[smith558]

Thank you for your contribution! 🙂 @chad3814

[smith558]

Thanks for the review!! @memowe

[chad3814]

thanks everyone, I'm just learning me a haskell…