[Magic Firewall] Add note for existing rules

[Maddy-Cloudflare]

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[hyperlint-ai]

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PR Change Summary

Added clarification regarding existing rules for IPv4 in the Magic Firewall documentation.

• Clarified that all existing rules apply to IPv4 when adding a new rule.

Modified Files

• src/content/docs/magic-firewall/how-to/add-rules.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-firewall/	@Maddy-Cloudflare, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://ffbf9224.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-magic-firewall-pcx-15246.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/magic-firewall/how-to/add-rules/	https://maddy-magic-firewall-pcx-15246.preview.developers.cloudflare.com/magic-firewall/how-to/add-rules/