Update concepts-limits.md

Author: StefArroyo

articles/cosmos-db/concepts-limits.md

@@ -138,11 +138,11 @@ The following table lists resource limits per subscription or account.
 
 | Resource | Limit |
 | --- | --- |
-| Maximum number of accounts per subscription | 50 by default. ¹ |
+| Maximum number of accounts per subscription | 250 by default ¹ |
 | Maximum number of databases & containers per account | 500 ² |
 | Maximum throughput supported by an account for metadata operations | 240 RU/s |
 
-¹ You can increase these limits by creating an [Azure Support request](create-support-request-quota-increase.md) up to 1,000 max.
+¹ Internal and external default limits differ. You can increase these limits by creating an [Azure Support request](create-support-request-quota-increase.md) up to 1,000 max. Cosmos DB reserves the right to delete any empty database accounts i.e. no databases/collections.
 ² This limit cannot be increased. Total count of both with an account. (1 database and 499 containers, 250 databases and 250 containers, etc.)
 
 ### Request limits