[Gateway] Clarify H3 behavior

[maxvp]

PCX-17033

[hyperlint-ai]

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PR Change Summary

Clarified the behavior of the Gateway regarding HTTP/3 traffic inspection and updated instructions for disabling QUIC in various browsers.

• Enhanced explanation of how Gateway inspects HTTP/3 traffic from browsers and applications.
• Updated instructions for disabling QUIC in Chrome, Firefox, and Edge.
• Noted that QUIC cannot be disabled in Safari, resulting in HTTP/3 traffic being sent directly.

Modified Files

• src/content/docs/cloudflare-one/policies/gateway/http-policies/http3.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/cloudflare-one/policies/gateway/	@maxvp, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://ba9e8a7a.preview.developers.cloudflare.com
Preview Branch URL: https://max-gw-h3-update.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/policies/gateway/http-policies/http3/	https://max-gw-h3-update.preview.developers.cloudflare.com/cloudflare-one/policies/gateway/http-policies/http3/