[BGP] Updates 4-byte setting

[marciocloudflare]

Summary

Closes PCX-16110

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated BGP documentation to include support for 4-byte ASNs and clarified ASN selection process.

• Removed the limitation stating that 4-byte ASNs are not supported.
• Clarified that customer device ASN can be 2-byte or 4-byte during BGP peering setup.

Modified Files

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

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