Clarified comments

ref #90

src/models/actions/create/CreateDistanceDonation.ts

@@ -11,7 +11,7 @@ import { CreateDonation } from './CreateDonation';
 export class CreateDistanceDonation extends CreateDonation {
 
     /**
-     * The donation's associated runner.
+     * The donation's associated runner's id.
      * This is important to link the runner's distance ran to the donation.
      */
     @IsInt()

src/models/actions/create/CreateDonation.ts

@@ -9,7 +9,7 @@ import { Donor } from '../../entities/Donor';
  */
 export abstract class CreateDonation {
     /**
-     * The donation's associated donor.
+     * The donation's associated donor's id.
      * This is important to link donations to donors.
      */
     @IsInt()