Update tutorial-create-power-app-with-mysql.md (Typo "flexible server…

[hyoshioka0128]

…"→"Flexible Server")

https://github.com/MicrosoftDocs/azure-databases-docs/blob/main/articles/mysql/flexible-server/tutorial-create-power-app-with-mysql.md
#PingMSFTDocs

[prmerger-automator]

@hyoshioka0128 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[hyoshioka0128]

@SudheeshGH - related #10

[learn-build-service-prod]

Learn Build status updates of commit 2cff9e5:

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File	Status	Preview URL	Details
articles/mysql/flexible-server/tutorial-create-power-app-with-mysql.md	✅Succeeded

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[Jak-MS]

@hyoshioka0128 - thanks!