Code + comment cleanup for the entities

ref #39

src/models/entities/RunnerOrganisation.ts

@@ -5,22 +5,23 @@ import { RunnerGroup } from "./RunnerGroup";
 import { RunnerTeam } from "./RunnerTeam";
 
 /**
- * Defines a runner organisation (business or school for example).
+ * Defines the RunnerOrganisation entity.
+ * This usually is a school, club or company.
 */
 @ChildEntity()
 export class RunnerOrganisation extends RunnerGroup {
 
   /**
    * The organisations's address.
-   * Optional
    */
   @IsOptional()
   @ManyToOne(() => Address, address => address.groups, { nullable: true })
   address?: Address;
 
   /**
- * Used to link teams to runner groups.
- */
+   * The organisation's teams.
+   * Used to link teams to a organisation.
+   */
   @OneToMany(() => RunnerTeam, team => team.parentGroup, { nullable: true })
   teams: RunnerTeam[];
 }