docs(blog): fix diff highlights in tutorial for getPost function

[roddds]

This bit was a little confusing to me (but also, granted, it was very late at night).

[remix-cla-bot]

Hi @roddds,

Welcome, and thank you for contributing to Remix!

Before we consider your pull request, we ask that you sign our Contributor License Agreement (CLA). We require this only once.

You may review the CLA and sign it by adding your name to contributors.yml.

Once the CLA is signed, the CLA Signed label will be added to the pull request.

If you have already signed the CLA and received this response in error, or if you have any questions, please contact us at hello@remix.run.

Thanks!

- The Remix team

[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[ryanflorence]

hey sorry for taking a while to get to this, you mind doing this again but branch from the main branch? Docs updates go to main because then they sync to the website. Thanks!

[kentcdodds]

You're right, that was weird. Let's just remove the highlight altogether. Doesn't make sense to highlight basically the whole block. https://youtu.be/GYmHYQPaHaw?t=46 😅

Thanks!