Update login form label to provide instructions for obtaining the code from the Minecraft server.

frontend/src/app/shared-components/login/login.component.html

@@ -2,7 +2,7 @@
 <div mat-dialog-content>
   <form [formGroup]="loginForm">
     <mat-form-field appearance="fill" style="width: 100%">
-      <mat-label>Enter your code</mat-label>
+      <mat-label>Enter your code<br>Get your code by doing: /login on the minecraft server</mat-label>
       <input matInput formControlName="code" type="text" (keyup)="onKeyUp()">
       @if (loginForm.get('code')?.errors?.['required']) {
         <mat-error>