Document the inherited_tags field

Author: Alef-Burzmali

docs/data-model.md

@@ -79,6 +79,8 @@ By convention, if the list of source ports or destination ports is empty, this m
 
 **Data Flow Groups** form a forest of groups. They can also be assigned to an Application. Data Flow Groups can be enabled and disabled and inherit the status of their parent. Disabled Data Flow Groups disable all the Data Flows contained within.
 
+Only in the REST API, the inherited list of tags is available (inherited_tags when reading and inherited_tag when filtering). This is the set of tags of the data flow and its parent groups. This field is not displyed in the UI.
+
 ### Object Alias
 
 **Object Aliases** are a group of references to other NetBox objects. Object Aliases are used as sources and destinations of Data Flows and corresponds to the groups or aliases used in firewall configuration.