[Functions] Add simple EventContext example in functions api_reference.mdx

[Ownwn]

Summary

Added a code example of getting the request url/pathname. The url parameter is quite far down the Workers Request api reference, so it can be easily missed IMO. Also add an in-text link to bindings.

Screenshots (optional)

Documentation checklist

• [x] The documentation style guide has been adhered to.

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PR Change Summary

Added a code example for accessing request parameters in the functions API documentation and improved the linking to bindings.

• Introduced a code example demonstrating how to access the request URL and pathname.
• Added an in-text link to the bindings documentation for better navigation.
• Ensured adherence to the documentation style guide.

Modified Files

• src/content/docs/pages/functions/api-reference.mdx

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