fix code snippet by removing useless async

[vicb]

Summary

remove async because the function is sync.

Documentation checklist

• The change adheres to the documentation style guide.

[github-actions]

This PR requires additional review attention because it affects the following areas:

Partials

This PR updates partial files, which are pieces of content used across multiple files in our Render component.

• workers/respond-another-site-example-js - view affected files

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @korinne, @WalshyDev, @cloudflare/deploy-config, @cloudflare/pcx-technical-writing, @kodster28, @cloudflare/wrangler, @cloudflare/workers-runtime-1
/src/content/partials/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @WalshyDev, @cloudflare/deploy-config, @cloudflare/pcx-technical-writing, @kodster28, @cloudflare/wrangler, @cloudflare/workers-runtime-1

[github-actions]

Preview URL: https://33f89949.preview.developers.cloudflare.com
Preview Branch URL: https://vic-async.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/examples/respond-with-another-site/	https://vic-async.preview.developers.cloudflare.com/workers/examples/respond-with-another-site/

[vicb]

Thanks for the review @kodster28 !