Add additional explanation about define:vars directive

[ArmandPhilippot]

Description (required)

I added additional information about define:vars directive on two pages:

• https://docs.astro.build/en/basics/astro-syntax/#dynamic-tags

The define:vars directive does not work with dynamic tags and I have seen some issues related to that on the main repository so I think it should be clarified.

• https://docs.astro.build/en/reference/directives-reference/#isinline

The statement was not exact since, as stated in #3165: using define:vars on <style /> tag does not automatically apply the is:inline directive.

Related issues & labels (optional)

• Closes Add a warning about dynamic tags and reword another in Template Directives #6477.
• Suggested label: improve-documentation

First-time contributor to Astro Docs?

ar_phi

(I'm not often connected... but I should get an email when mentioned if needed.)

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[sarah11918]

Looks great @ArmandPhilippot and I really appreciate you taking the time both to point out the issues and suggested fixes and to come and make a PR to improve the documentation. Welcome to Team Docs! 🥳