fix: be less strict so there are no/less breaking changes

Author: gavinwade12

specs/composition/common/schemas/components/CompositionBehavior.yml

@@ -1,22 +1,9 @@
 compositionBehavior:
-  oneOf:
-    - $ref: '#/compositionInjectionBehavior'
-    - $ref: '#/compositionMultifeedBehavior'
-
-compositionInjectionBehavior:
   type: object
   additionalProperties: false
+  description: An object containing either an `injection` or `multifeed` behavior schema, but not both.
   properties:
     injection:
       $ref: './injection/Behaviour.yml#/injection'
-  required:
-    - injection
-
-compositionMultifeedBehavior:
-  type: object
-  additionalProperties: false
-  properties:
     multifeed:
       $ref: './multifeed/Behaviour.yml#/multifeed'
-  required:
-    - multifeed