Code + comment cleanup for the entities

ref #39

src/models/entities/RunnerGroup.ts

@@ -9,7 +9,8 @@ import { GroupContact } from "./GroupContact";
 import { Runner } from "./Runner";
 
 /**
- * Defines the runnerGroup interface.
+ * Defines the RunnerGroup entity.
+ * This is used to group runners together (as the name suggests).
 */
 @Entity()
 @TableInheritance({ column: { name: "type", type: "varchar" } })
@@ -31,13 +32,14 @@ export abstract class RunnerGroup {
 
   /**
    * The group's contact.
-   * Optional
+   * This is mostly a feature for the group managers and public relations.
    */
   @IsOptional()
   @ManyToOne(() => GroupContact, contact => contact.groups, { nullable: true })
   contact?: GroupContact;
 
   /**
+   * The group's associated runners.
    * Used to link runners to a runner group.
    */
   @OneToMany(() => Runner, runner => runner.group, { nullable: true })