Feedback: /api/deno/~/Deno.openKv - Needs Improvement

## Documentation Feedback

**Path:** /api/deno/~/Deno.openKv
**Helpful:** No ❌

**Feedback:**
> demo code example

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*This issue was automatically created from the documentation feedback system.*

Open the documentation page at /api/deno/~/Deno.openKv and inspect its current content and nearby API documentation for context. Add a useful demo code example to the Deno.openKv documentation, then verify that the rendered page clearly includes the example.

Written by the indexing model from the issue text.