Update how-to-network-from-private-to-public.md (Typo "flexible serve…

[hyoshioka0128]

…r"→"Flexible Server")

https://github.com/MicrosoftDocs/azure-databases-docs/blob/main/articles/mysql/flexible-server/how-to-network-from-private-to-public.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]

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[v-dirichards]

Looks good, thanks @hyoshioka0128