Update cosmos-db.md

[jaydestro]

corrected URL for line 59

@kushagraThapar - please review and merge.

[opbld33]

Docs Build status updates of commit b980406:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs-ref-services/latest/cosmos-db.md	⚠️Warning	View (azure-java-stable)	Details

docs-ref-services/latest/cosmos-db.md

• Line 3, Column 13: [Warning: ms-service-subservice-invalid - See documentation] Invalid value for 'ms.service': 'cosmosdb'.

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