Update override-expressions.mdx

[omer-cloudflare]

Clarified the expressions section.

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
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PR Change Summary

Clarified the override expressions section in the DDoS protection documentation.

• Updated the explanation of how override expressions function in relation to mitigation and detection.
• Clarified the limitations of using source IP addresses in override expressions during DDoS attacks.
• Provided examples to illustrate the application of override expressions and their effectiveness.

Modified Files

• src/content/docs/ddos-protection/managed-rulesets/network/override-expressions.mdx

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