Update workersai.mdx

[kathayl]

Make more clear how to use binding with Workers AI

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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

[kathayl]

@daisyfaithauma
I'm trying to make it more clear to users how to use the binding when using workers AI.

• I think we should link to the integrations page from this workers AI provider page. https://developers.cloudflare.com/ai-gateway/integrations/aig-workers-ai-binding/
• not sure if I did the formatting correctly but the binding section should be at the same level as the REST API and not under examples
• I feel like the integrations page has some really good info that should also be on the workers AI provider page. So can you make sure that the workers AI provider page has all the relevant info too?

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Original Link	Updated Link
https://developers.cloudflare.com/ai-gateway/providers/workersai/	https://kathayl-patch-1.cloudflare-docs-7ou.pages.dev/ai-gateway/providers/workersai/