Fix string operator typo in supported KQL features for transforms

[wanion]

There's a typo where the string comparison operator `==` has accidentally been truncated to `= and this fixes it.

It also fixes the typo in the ms.reviewer tag.

[prmerger-automator]

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[Copilot]

Pull request overview

This PR fixes two typos in the KQL transformations documentation: a misspelled metadata tag and a truncated string operator in the list of supported KQL features.

• Corrected the ms.reviewer metadata tag spelling
• Fixed the truncated string comparison operator from `= to `==`

[learn-build-service-prod]

Learn Build status updates of commit f79b8b3:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/azure-monitor/data-collection/data-collection-transformations-kql.md	✅Succeeded

For more details, please refer to the build report.

[ktoliver]

@bwren

Can you review the proposed changes?

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[v-ccolin]

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