Added known issue for sparse page blob downloads

[schoag-msft]

[learn-build-service-prod[bot]]

Learn Build status updates of commit d539c12:

:warning: Validation status: warnings

File	Status	Preview URL	Details
docs-ref-services/latest/storage.md	:warning:Warning	View (azure-python)	Details

docs-ref-services/latest/storage.md

• Line 7, Column 13: [Warning: ms-service-subservice-invalid - See documentation] Invalid value for 'ms.service': 'storage'.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 6c5c08e:

:warning: Validation status: warnings

File	Status	Preview URL	Details
docs-ref-services/latest/storage.md	:warning:Warning	View (azure-python)	Details

docs-ref-services/latest/storage.md

• Line 7, Column 13: [Warning: ms-service-subservice-invalid - See documentation] Invalid value for 'ms.service': 'storage'.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

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

[learn-build-service-prod[bot]]

Learn Build status updates of commit d1212da:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
docs-ref-services/latest/storage.md	:white_check_mark:Succeeded	View (azure-python)

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