Fix typo: fschk -> fsck

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Learn Build status updates of commit c0420a3:

:bulb: Validation status: suggestions

File	Status	Preview URL	Details
articles/hdinsight/overview-azure-storage.md	:bulb:Suggestion		Details

articles/hdinsight/overview-azure-storage.md

• Line 5, Column 11: [Suggestion: value-deprecated-replace - See documentation] The 'ms.topic: conceptual' you used is now deprecated and can no longer be used. We suggest you replace it with 'ms.topic: article'.

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