Fix typo in email validation message for improved clarity in appeal form UI.

frontend/src/app/pages/forms/appeal/appeal.component.html

@@ -97,7 +97,7 @@
                     <div class="valid-email">
                       <ng-container matSuffix>
                         <mat-icon>check</mat-icon>
-                        <span>Your have already validated your email, and can continue to the next page!</span>
+                        <span>You have validated your email previously, and can continue to the next page!</span>
                       </ng-container>
                     </div>
                   }