Remove experimental opt-in from lazy list stickyHeader snippets

[nickbutcher]

As they are now stable

[gemini-code-assist]

Summary of Changes

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This pull request updates code snippets for LazyColumn sticky headers by removing the ExperimentalFoundationApi opt-in annotation. This change reflects the stabilization of the sticky header functionality within Compose's lazy lists, making the examples cleaner and aligned with the current stable API status.

Highlights

• API Stabilization: The @OptIn(ExperimentalFoundationApi::class) annotation has been removed from LazyColumn sticky header snippets, indicating that this API is now stable and no longer requires explicit opt-in.

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[gemini-code-assist]

Code Review

This pull request correctly removes the @OptIn(ExperimentalFoundationApi::class) annotations from the stickyHeader snippets, reflecting that the API is now stable. The changes are accurate and improve code hygiene. This is a good cleanup.