[AutoPR azure-mgmt-cosmosdb] update cosmos readme.java.md#3953

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openapi-sdkautomation[bot] wants to merge 1 commit intorelease/v3from sdkAuto/12663/azure-mgmt-cosmosdb

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Commits on Jan 27, 2021

CodeGen from PR 12663 in Azure/azure-rest-api-specs
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