Options: add a "Learn more" link to Android Apps section and tweak strings

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 6609 matching lines @@
   </message>
   <message name="IDS_FLAGS_PRINTER_PROVIDER_SEARCH_APP_DESCRIPTION" desc="Description of a flag in chrome://flags that enables launching Chrome Web Store Gallery widget app for searching for printer provider apps.">
     Enables Chrome Web Store Gallery app for printer drivers. The app searches Chrome Web Store for extensions that support printing to a USB printer with specific USB ID.
   </message>
 
   <!-- Android Apps -->
   <message name="IDS_OPTIONS_ARC_TITLE" desc="The title of Android Apps section.">
     Android Apps
   </message>
   <message name="IDS_OPTIONS_ARC_ENABLE" desc="Label for the checkbox that enables Android apps.">
-    Enable Android Apps to run on your Chromebook.
+    Enable Android Apps on your Chromebook.
   </message>
   <message name="IDS_OPTIONS_ARC_MANAGE_APPS" desc="Label for launching  Android apps settings.">
-    Manage your Android apps via <ph name="BEGIN_LINK">&lt;a is="action-link" id="android-apps-settings-link" role="link"&gt;</ph>App Settings<ph name="END_LINK">&lt;/a&gt;</ph>.
+    Manage your Android apps in <ph name="BEGIN_LINK">&lt;a is="action-link" id="android-apps-settings-link" role="link"&gt;</ph>Settings<ph name="END_LINK">&lt;/a&gt;</ph>.
   </message>
   <message name="IDS_ARC_NOTIFICATION_TITLE" desc="Title of the first-run notification that enables Android apps.">
     Google Play Store
   </message>
   <message name="IDS_ARC_NOTIFICATION_MESSAGE" desc="Description message of the first-run notification that enables Android apps.">
     Over a million apps and games now available on your <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph>.
   </message>
   <message name="IDS_ARC_OPEN_PLAY_STORE_NOTIFICATION_BUTTON" desc="Label for the button in the first-run notification that enables Android apps.">
     Open Play Store
   </message>
@@ skipping 78 matching lines @@
   <message name="IDS_ARC_ANDROID_MANAGEMENT_REQUIRED_ERROR" desc="Error message shown when Android management is required for an unmanaged Chrome OS user.">
     Your organization has not enabled Android Apps for your account. Contact your administrator for more information.
   </message>
   <message name="IDS_FLAGS_ENABLE_IME_MENU_NAME" desc="Name of the about: flag for enabling opt-in IME menu.">
     Enable opt-in IME menu
     </message>
   <message name="IDS_FLAGS_ENABLE_IME_MENU_DESCRIPTION" desc="Description of the about: flag for enabling opt-in IME menu.">
     Enable access to the new IME menu in the Language Settings page.
   </message>
 </grit-part>