[Containers] document custom instance types in configuration.mdx

[nikitassharma]

Add documentation to reflect wrangler change that adds support for custom instance types.

Summary

Document how to set custom instance types for enterprise customers. This documents the wrangler change being made in cloudflare/workers-sdk#9962.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Added documentation for custom instance types in the configuration file for enterprise customers, reflecting recent changes in the wrangler.

• Documented how to set custom instance types for enterprise customers.
• Outlined configuration options for vCPU, memory, and disk settings.
• Provided an example configuration in the wrangler.toml format.

Modified Files

• src/content/docs/workers/wrangler/configuration.mdx

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