Update host selector limitations

[lfcassidy]

PCX-18186 and PCX-18166

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PR Change Summary

Updated host selector limitations for egress policies, clarifying the behavior of DNS responses and enabling selectors through the UI.

• Clarified that Gateway will overwrite DNS responses for all supported traffic regardless of user or device selectors.
• Updated instructions for enabling host selectors from API to UI settings.
• Specified that the WARP client must be in Gateway with WARP mode for correct traffic routing.

Modified Files

• src/content/docs/cloudflare-one/policies/gateway/egress-policies/index.mdx

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