Fix sanity test error with module documentation syntax

Author: DouglasHeriot

plugins/modules/netbox_aggregate.py

@@ -47,7 +47,7 @@
       rir:
         description:
           - The RIR the aggregate will be assigned to
-        required:true
+        required: true
       date_added:
         description:
           - Date added, format: YYYY-MM-DD