[MT] Added language around supernets

[marciocloudflare]

Summary

Closes PCX-10820

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Enhanced documentation regarding the onboarding and announcement of prefixes in Magic Transit, clarifying the requirements for prefix size and disaggregation.

• Clarified the process for announcing prefixes in Magic Transit.
• Specified that smaller sub-prefixes must be onboarded separately for announcement.
• Emphasized that each onboarded prefix is treated as a separate billable unit.

Modified Files

• src/content/docs/magic-transit/how-to/advertise-prefixes.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/magic-transit/	@marciocloudflare, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://7cf5b198.preview.developers.cloudflare.com
Preview Branch URL: https://marcio-pcx10820-mt-supernets.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/magic-transit/how-to/advertise-prefixes/	https://marcio-pcx10820-mt-supernets.preview.developers.cloudflare.com/magic-transit/how-to/advertise-prefixes/