more commentary, including for blank values for the user

src/views/AccountViewView.vue

@@ -377,6 +377,11 @@
           Use Test 2
         </button>
       </div>
+      <span class="px-4 text-sm" v-if="!webPushServerInput">
+        When that setting is blank, this app will use the default web push
+        server URL:
+        {{ AppConstants.DEFAULT_PUSH_SERVER }}
+      </span>
     </div>
   </section>
 </template>