[BGP] Added AS prepending to route prioritization

[marciocloudflare]

Summary

Closes PCX-15039

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Enhanced BGP documentation by introducing AS prepending and its impact on route prioritization.

• Added a section on BGP communities and AS prepending for traffic engineering.
• Explained how AS prepending affects route priority in conjunction with community values.
• Provided a list of community values for setting base route priority.

Modified Files

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

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