Update sys-dm-os-memory-brokers-transact-sql.md

Included a comment on "MEMORYBROKER_FOR_CACHE" to avoid confusion with Buffer Pool Cache

Author: FonsecaSergio

docs/relational-databases/system-dynamic-management-views/sys-dm-os-memory-brokers-transact-sql.md

@@ -38,7 +38,7 @@ manager: craigg
 |Column name|Data type|Description|  
 |-----------------|---------------|-----------------|  
 |**pool_id**|**int**|ID of the resource pool if it is associated with a Resource Governor pool.|  
-|**memory_broker_type**|**nvarchar(60)**|Type of memory broker. There are currently three types of memory brokers in [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)], listed below with their descriptions.<br /><br /> **MEMORYBROKER_FOR_CACHE** : Memory that is allocated for use by cached objects.<br /><br /> **MEMORYBROKER_FOR_STEAL** : Memory that is stolen from the buffer pool. This memory is not available for reuse by other components until it is freed by the current owner.<br /><br /> **MEMORYBROKER_FOR_RESERVE** : Memory reserved for future use by currently executing requests.|  
+|**memory_broker_type**|**nvarchar(60)**|Type of memory broker. There are currently three types of memory brokers in [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)], listed below with their descriptions.<br /><br /> **MEMORYBROKER_FOR_CACHE** : Memory that is allocated for use by cached objects (Not Buffer Pool cache).<br /><br /> **MEMORYBROKER_FOR_STEAL** : Memory that is stolen from the buffer pool. This memory is not available for reuse by other components until it is freed by the current owner.<br /><br /> **MEMORYBROKER_FOR_RESERVE** : Memory reserved for future use by currently executing requests.|  
 |**allocations_kb**|**bigint**|Amount of memory, in kilobytes (KB), that has been allocated to this type of broker.|  
 |**allocations_kb_per_sec**|**bigint**|Rate of memory allocations in kilobytes (KB) per second. This value can be negative for memory deallocations.|  
 |**predicted_allocations_kb**|**bigint**|Predicted amount of allocated memory by the broker. This is based on the memory usage pattern.|