Update the exclamation icon can be announced by screen reader

* In hearing deivce and flash notifications U features.

Bug: 268144365
Test: open screen reader to read the footer preference
Change-Id: Ifb0809c1e445aea4aeea9db9b4ec09cd6d0d4095

src/com/android/settings/accessibility/FlashNotificationsFooterPreferenceController.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.accessibility;
+
+import android.content.Context;
+
+import com.android.settings.R;
+
+/** Preference controller for footer in flash notifications page. */
+public class FlashNotificationsFooterPreferenceController extends
+        AccessibilityFooterPreferenceController {
+    public FlashNotificationsFooterPreferenceController(Context context,
+            String key) {
+        super(context, key);
+    }
+
+    @Override
+    protected String getIntroductionTitle() {
+        return mContext.getString(R.string.flash_notifications_about_title);
+    }
+}