Start to making some incremental improvements to node compat docs

[jasnell]

Summary

Start making some incremental improvements to the Workers nodejs_compat docs.

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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

[hyperlint-ai]

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PR Change Summary

Made incremental improvements to the Workers Node.js compatibility documentation, enhancing clarity and detail.

• Updated documentation to include links to relevant Node.js API references.
• Clarified the behavior of the EventEmitter and Buffer APIs in the Workers runtime.
• Added information about unsupported features in the crypto module.

Modified Files

• src/content/docs/workers/runtime-apis/nodejs/EventEmitter.mdx
• src/content/docs/workers/runtime-apis/nodejs/assert.mdx
• src/content/docs/workers/runtime-apis/nodejs/buffer.mdx
• src/content/docs/workers/runtime-apis/nodejs/crypto.mdx

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[mikenomitch]

Layman's description of zero-filled would probably help