Use Azure Cosmos DB for PostgreSQL instead of Azure Database for PostgreSQL in the README (#6432)
Use Azure Cosmos DB for PostgreSQL instead of Azure Database for PostgreSQL in the README (#6432)

For more details:
https://devblogs.microsoft.com/cosmosdb/distributed-postgresql-comes-to-azure-cosmos-db/

Co-authored-by: Claire Giordano <da7dd17269675e6648b2de3690262d0e18b89cca@citusdata.com>
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