correct column name typo 'on_disk_size'

previously 'on_disc_size'

Author: goonerCW

docs/relational-databases/system-catalog-views/sys-pdw-nodes-column-store-dictionaries-transact-sql.md

@@ -28,7 +28,7 @@ monikerRange: ">=aps-pdw-2016||=azure-sqldw-latest"
 |**type**|**int**|Dictionary type:<br /><br /> 1 - Hash dictionary containing **int** values<br /><br /> 2 - Not used<br /><br /> 3 - Hash dictionary containing string values<br /><br /> 4 - Hash dictionary containing **float** values|  
 |**last_id**|**int**|The last data id in the dictionary.|  
 |**entry_count**|**bigint**|Number of entries in the dictionary.|  
-|**on_disc_size**|**bigint**|Size of dictionary in bytes.|  
+|**on_disk_size**|**bigint**|Size of dictionary in bytes.|  
 |**pdw_node_id**|**int**|Unique identifier of a [!INCLUDE[ssazuresynapse-md](../../includes/ssazuresynapse-md.md)] node.|  
 
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