Code + comment cleanup for the entities

ref #39

src/models/entities/RunnerTeam.ts

@@ -4,14 +4,15 @@ import { RunnerGroup } from "./RunnerGroup";
 import { RunnerOrganisation } from "./RunnerOrganisation";
 
 /**
- * Defines a runner team (class or deparment for example).
+ * Defines the RunnerTeam entity.
+ * This usually is a school class or department in a company.
 */
 @ChildEntity()
 export class RunnerTeam extends RunnerGroup {
 
   /**
    * The team's parent group.
-   * Optional
+   * Every team has to be part of a runnerOrganisation - this get's checked on creation and update.
    */
   @IsNotEmpty()
   @ManyToOne(() => RunnerOrganisation, org => org.teams, { nullable: true })