[Docs site] update wrong link in workers-ai/guides/prompting page

[jsparkdev]

Summary

Fixed links that were going to the wrong page that didn't match the link text.

The site I updated may not be the one users should be going to, so please let me know if this is the case.

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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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