Update connect-php.md (Typo "flexible server"→"Flexible Server")

[hyoshioka0128]

https://github.com/MicrosoftDocs/azure-databases-docs/blob/main/articles/mysql/flexible-server/connect-php.md
#PingMSFTDocs

[prmerger-automator]

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

[hyoshioka0128]

@shreyaaithal - related #9

[learn-build-service-prod]

Learn Build status updates of commit c99cdb5:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/mysql/flexible-server/connect-php.md	✅Succeeded

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For any questions, please:

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[ShannonLeavitt]

@shreyaaithal

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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[learn-build-service-prod]

Learn Build status updates of commit ab9b648:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/mysql/flexible-server/connect-php.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 250737c:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/mysql/flexible-server/connect-php.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[hyoshioka0128]

@shreyaaithal - This PR needs your review.