Update plans.mdx

[jmanzanoCF]

Was missing 1918 after RFC

Summary

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Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated the documentation to include specific reference to RFC 1918 addressing in the Secure Web Gateway section.

• Clarified the Secure Web Gateway documentation by specifying RFC 1918 address space.
• Ensured accurate representation of traffic handling capabilities in the documentation.

Modified Files

• src/content/docs/magic-firewall/plans.mdx

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