[MWAN Connector] Adds self serve option

[marciocloudflare]

Summary

Closes PCX15594

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Added self-serve options for the MWAN Connector, improving documentation clarity and navigation.

• Updated links in the NAT and routed subnets documentation for better accuracy.
• Clarified instructions for configuring multiple tunnels in the WAN profile.

Modified Files

• src/content/docs/magic-wan/configuration/connector/network-options/nat-subnet.mdx
• src/content/docs/magic-wan/configuration/connector/network-options/routed-subnets.mdx
• src/content/docs/magic-wan/configuration/connector/reference.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-wan/	@marciocloudflare, @cloudflare/pcx-technical-writing
*	@cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://16905384.preview.developers.cloudflare.com
Preview Branch URL: https://marcio-pcx15594-mconn-self-serve.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/magic-wan/configuration/connector/network-options/nat-subnet/	https://marcio-pcx15594-mconn-self-serve.preview.developers.cloudflare.com/magic-wan/configuration/connector/network-options/nat-subnet/
https://developers.cloudflare.com/magic-wan/configuration/connector/network-options/routed-subnets/	https://marcio-pcx15594-mconn-self-serve.preview.developers.cloudflare.com/magic-wan/configuration/connector/network-options/routed-subnets/
https://developers.cloudflare.com/magic-wan/configuration/connector/reference/	https://marcio-pcx15594-mconn-self-serve.preview.developers.cloudflare.com/magic-wan/configuration/connector/reference/