docs: update layouts.mdx

[jsparkdev]

Description (required)

• update layouts.mdx
• removed the wording that doesn't match the current version of Astro and modified the example code blocks.
• The docs and the starter project seem to disagree about putting everything in html tags in layouts. #10532

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[sarah11918]

Thanks for snagging this issue @jsparkdev ! Removing the sentence is perfect, but I commented below that I don't think we should change our example from the common use!

[sarah11918]

Perfect, thank you! 💜

[sarah11918]

Ugh, will look into the failed Netlify deploy and see whether it was just a fluke!

[jsparkdev]

It seems to be working now. Thank you!