doc: Update messaging when deleting a contact to warn about same DIDs.

src/views/DIDView.vue

@@ -490,6 +490,7 @@ export default class DIDView extends Vue {
       message +=
         " Note that they can see your activity, so if you want to hide your activity from them then you should do that first.";
     }
+    message += " Note that this will also remove anyone with the same DID underneath.";
     this.notify.confirm(message, async () => {
       await this.deleteContact(contact);
     });