docs: Improves doc for cores and memory

decoder/job-definition-schema.yaml

@@ -148,6 +148,10 @@ definitions:
 
   # A kubernetes CPU (cores) declaration (minimum of 10m).
   # Here we allow an up-to 4-digit 'm' value or a 2-digit integer.
+  # The value is used by the Data Manager to set the corresponding Job
+  # resource request and limit values. By providing this value you
+  # essentially define a "guaranteed" minimum CPU allocation for the Job.
+  # If you do not specify a value, the Data Manager will use a default.
   cores:
     oneOf:
     - type: string
@@ -159,6 +163,10 @@ definitions:
   # A kubernetes memory declaration.
   # Here we allow an up-to 4-digit Mi value (minimum of 100Mi)
   # or a 2-digit Gi value (minimum of 1G).
+  # The value is used by the Data Manager to set the corresponding Job
+  # resource request and limit values. By providing this value you
+  # essentially define a "guaranteed" minimum memory budget for the Job.
+  # If you do not specify a value, the Data Manager will use a default.
   memory:
     type: string
     pattern: '^([1-9][0-9]{2,3}Mi|[1-9][0-9]{0,1}Gi)$'