better comments in ParentModel

Author: gilesknap

src/deploy_tools/models/parent.py

@@ -2,6 +2,14 @@
 
 
 class ParentModel(BaseModel):
-    """Will forbid any extra parameters being provided in any subclass."""
+    """
+    Standard Model Config for all models in this project:
+      forbid: forbid any extra parameters being provided in any subclass.
+      use_enum_values: use the enum value only when serializing the model,
+        this means the yaml serializer can work with enums
+    """
 
-    model_config = ConfigDict(extra="forbid", use_enum_values=True)
+    model_config = ConfigDict(
+        extra="forbid",
+        use_enum_values=True,
+    )