Move tether settings help to menu and remove local assets.

Bug: 5270092

Using web help instead of local assets.

Change-Id: Ib93e72443b30367521febc43279422ec130efbd5
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 233b668..027e91d 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -3986,4 +3986,6 @@
     <string name="help_url_choose_lockscreen" translatable="false"></string>
     <!-- Help URL, Backup & reset [DO NOT TRANSLATE] -->
     <string name="help_url_backup_reset" translatable="false"></string>
+    <!-- Help URL, Tethering [DO NOT TRANSLATE] -->
+    <string name="help_url_tether" translatable="false"></string>
 </resources>