docs: Update DashboardMetadata docs (#402)

* Update DashboardMetadata docs

Signed-off-by: Joseph Atkins-Turkish <jatkins-turkish@brex.com>

* Update dashboard_metadata.py

Signed-off-by: Joseph Atkins-Turkish <jatkins-turkish@brex.com>

databuilder/models/dashboard/dashboard_metadata.py

@@ -18,16 +18,15 @@
 
 class DashboardMetadata(Neo4jCsvSerializable):
     """
-    Dashboard metadata that contains dashboard group name, dashboardgroup description, dashboard description,
-    along with tags, owner userid and lastreloadtime.
-    (Owner ID and last reload time will be supported by separate Extractor later on with more information)
+    Dashboard metadata including dashboard group name, dashboardgroup description, dashboard description,
+    and tags.
 
-    It implements Neo4jCsvSerializable so that it can be serialized to produce
-    Dashboard, Tag, Description, Lastreloadtime and relation of those. Additionally, it will create
-    Dashboardgroup with relationships to Dashboard. If users exist in neo4j, it will create
-    the relation between dashboard and user (owner).
+    Some other metadata e.g. Owners and last-reload/modified times are provided by other models
+    e.g. DashboardOwner
 
-    Lastreloadtime is the time when the Dashboard was last reloaded.
+    It implements Neo4jCsvSerializable so that it can be serialized to produce
+    Dashboard, Tag, Description and relations between those. Additionally, it will create a
+    Dashboardgroup with relationships to the Dashboard.
     """
     CLUSTER_KEY_FORMAT = '{product}_dashboard://{cluster}'
     CLUSTER_DASHBOARD_GROUP_RELATION_TYPE = 'DASHBOARD_GROUP'