[Docs site] update wrong link in astro framework guide

[jsparkdev]

Summary

update wrong link in astro framework guide

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated a link in the Astro framework guide to ensure accuracy.

• Corrected a link related to on-demand rendering in the Astro framework guide.

Modified Files

• src/content/docs/workers/frameworks/framework-guides/astro.mdx

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