CosmosDB Account should support Continuous 7-day tier

[The Azure Doc](https://docs.microsoft.com/en-us/azure/cosmos-db/continuous-backup-restore-introduction#continuous-30-day-tier-vs-continuous-7-day-tier) indicates CosmosDB Account supports Continuous 7-day tier. But after checked [azure rest api spec](https://github.com/Azure/azure-rest-api-specs/blob/main/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/stable/2022-05-15/cosmos-db.json#L8708), seems it doesn't support this feature. If it's expected feature, does it make sense to add this feature in azure rest api spec? Thanks.

Read the Azure Cosmos DB continuous backup documentation and inspect the linked cosmos-db.json REST API specification around line 8708. Confirm how the 7-day continuous tier is represented and whether the API specification is missing that support; done means the specification accurately exposes the documented tier.

Written by the indexing model from the issue text.