docs(tutorials/blog): fix links to MDN

[philandstuff]

mdn.io/request goes to https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods
which isn't what we want.

mdn.io/Request goes to https://developer.mozilla.org/en-US/docs/Web/API/Request
which is what we actually want here.

mdn.io/request.formData and mdn.io/Request.formData both redirect to the same place,
but I updated this link to match the other fix.

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