docs: fix code highlight

[Elfayer]

What does this PR do?

Fix code highlight line, see problem:

How did you verify your code works?

[coderabbitai]

Walkthrough

Inserted code placeholder comments before <link> tags in HTML snippets, repositioning TailwindCSS and stylesheet links to appear after the placeholders in documentation code examples.

Changes

Cohort / File(s)	Change Summary
Documentation updates docs/bundler/fullstack.mdx	Added code placeholder comments before <link> tags in HTML head and CSS styling sections; moved TailwindCSS and stylesheet link references after placeholders

Pre-merge checks

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'docs: fix code highlight' is vague and doesn't clearly describe what code highlighting issue was fixed or where in the documentation.	Provide a more specific title that describes the actual change, such as 'docs: fix code placeholder highlighting in fullstack bundler example' or similar.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description includes both required sections from the template and explains the issue with a screenshot, but lacks specific verification steps or testing details.

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