[BGP - MT/MWAN] Updated language CF ASN

[marciocloudflare]

Summary

Closes PCX-15605

Documentation checklist

• The documentation style guide has been adhered to.

[github-actions]

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[hyperlint-ai]

PR Change Summary

Updated the default Cloudflare-side ASN for BGP peering sessions in the documentation.

• Changed the default CF Account ASN from a generic description to a specific value of 13335.
• Clarified the configuration instructions for setting the ASN.

Modified Files

• src/content/partials/network-interconnect/bgp-peering.mdx

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[github-actions]

Preview URL: https://d0d0c23f.preview.developers.cloudflare.com
Preview Branch URL: https://marcio-pcx15605-mcn-asn13335.preview.developers.cloudflare.com