Updates messages for hearing devices related page

1. Updates hearing device page top intro message
2. Adds back the hearing device page footer with updated message

Bug: 321840161
Test: build pass, only simple UI change
Change-Id: I603630a14ab349d295ab8d5c1a00d841886d8e76
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 46c8f8c..e459c28 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -5118,8 +5118,8 @@
     <string name="accessibility_hearingaid_instruction_continue_button">Continue</string>
     <!-- Title for the accessibility preference for hearing devices. [CHAR LIMIT=35] -->
     <string name="accessibility_hearingaid_title">Hearing devices</string>
-    <!-- Introduction for the Hearing devices page to introduce feature. [CHAR LIMIT=NONE] -->
-    <string name="accessibility_hearingaid_intro">You can use hearing aids, cochlear implants, and other amplification devices with your phone</string>
+    <!-- Introduction for the Hearing devices page to introduce feature. [CHAR LIMIT=NONE BACKUP_MESSAGE_ID=5856992709195963850] -->
+    <string name="accessibility_hearingaid_intro">Set up and manage ASHA and LE Audio hearing aids, cochlear implants, and other amplification devices</string>
     <!-- Summary for the accessibility preference for hearing aid when not connected. [CHAR LIMIT=50] -->
     <string name="accessibility_hearingaid_not_connected_summary">No hearing devices connected</string>
     <!-- Summary for the accessibility preference for hearing aid when adding new devices. [CHAR LIMIT=50] -->
@@ -5154,6 +5154,8 @@
     <string name="accessibility_hac_mode_summary">Improves compatibility with telecoils and reduces unwanted noise</string>
     <!-- Title for accessibility hearing device page footer. [CHAR LIMIT=40] -->
     <string name="accessibility_hearing_device_about_title">About hearing devices</string>
+    <!-- Description for text in accessibility hearing aids footer. [CHAR LIMIT=NONE BACKUP_MESSAGE_ID=7451899224828040581] -->
+    <string name="accessibility_hearing_device_footer_summary">To find other hearing devices that aren’t supported by ASHA or LE Audio, tap <b>Pair new device</b> > <b>See more devices</b></string>
     <!-- Title for the pair hearing device page. [CHAR LIMIT=25] -->
     <string name="accessibility_hearing_device_pairing_page_title">Pair hearing device</string>
     <!-- Subtitle for the pair hearing device page. [CHAR LIMIT=NONE] -->
diff --git a/res/xml/accessibility_hearing_aids.xml b/res/xml/accessibility_hearing_aids.xml
index 27a4212..57a0fe2 100644
--- a/res/xml/accessibility_hearing_aids.xml
+++ b/res/xml/accessibility_hearing_aids.xml
@@ -60,4 +60,11 @@
             settings:searchable="true"
             settings:controller="com.android.settings.accessibility.HearingAidCompatibilityPreferenceController"/>
     </PreferenceCategory>
+
+    <com.android.settings.accessibility.AccessibilityFooterPreference
+        android:key="hearing_device_footer"
+        android:title="@string/accessibility_hearing_device_footer_summary"
+        android:selectable="false"
+        settings:searchable="false"
+        settings:controller="com.android.settings.accessibility.HearingDeviceFooterPreferenceController"/>
 </PreferenceScreen>
\ No newline at end of file
diff --git a/res/xml/hearing_device_pairing_fragment.xml b/res/xml/hearing_device_pairing_fragment.xml
index ce7f39f..d84f22b 100644
--- a/res/xml/hearing_device_pairing_fragment.xml
+++ b/res/xml/hearing_device_pairing_fragment.xml
@@ -38,5 +38,4 @@
             settings:useAdminDisabledSummary="true"
             settings:controller="com.android.settings.accessibility.ViewAllBluetoothDevicesPreferenceController"/>
     </PreferenceCategory>
-
 </PreferenceScreen>
\ No newline at end of file