[MWAN] Fortinet nat-t

[marciocloudflare]

Summary

Closes PCX-14589

Documentation checklist

• The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Added configuration instructions for enabling NAT traversal (NAT-T) in Fortinet IPsec tunnels.

• Introduced optional NAT-T configuration instructions for Fortinet devices.
• Provided steps to set the IKE port for NAT-T communications.
• Included a reference link to Fortinet's documentation for further details.

Modified Files

• src/content/docs/magic-wan/configuration/manually/third-party/fortinet.mdx

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