Add field description for allowed repos (open-policy-agent#115)

Signed-off-by: Max Smythe <smythe@google.com>

Co-authored-by: Sertaç Özercan <852750+sozercan@users.noreply.github.com>

library/general/allowedrepos/template.yaml

@@ -3,8 +3,8 @@ kind: ConstraintTemplate
 metadata:
   name: k8sallowedrepos
   annotations:
-    description: Requires container images to begin with a repo string from a specified
-      list.
+    description: >- 
+      Requires container images to begin with a string from the specified list.
 spec:
   crd:
     spec:
@@ -16,6 +16,7 @@ spec:
           type: object
           properties:
             repos:
+              description: The list of prefixes a container image is allowed to have.
               type: array
               items:
                 type: string