Update info about XRANK

[tklarsen]

Add info about potential effect on performance

Category

• Content fix
• New article
• Related issues: fixes #X, partially #Y, mentioned in #Z

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What's in this Pull Request?

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Guidance

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[spdevdocs]

✅ Validation status: passed

File	Status	Preview URL	Details
docs/general-development/keyword-query-language-kql-syntax-reference.md	✅Succeeded	View

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