MD Settings: Remove secondary text under Manage Supervised Users.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- Main Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_SECONDARY_USER_BANNER" desc="Banner displayed in settings page when the user is secondary in a multi-profile session.">
       Some settings belonging to <ph name="PRIMARY_EMAIL">$1<ex>john@google.com</ex></ph> are being shared with you. These settings only affect your account when using multiple sign-in.
     </message>
   </if>
 
@@ skipping 2207 matching lines @@
   <!-- Sync / People Page -->
   <message name="IDS_SETTINGS_PEOPLE" desc="Name of the settings page which manages Chrome's signed-in Google profile.">
     People
   </message>
   <message name="IDS_SETTINGS_PEOPLE_MANAGE_OTHER_PEOPLE" desc="Label for the button that opens the multi-profile user manager.">
     Manage other people
   </message>
   <message name="IDS_SETTINGS_PEOPLE_MANAGE_SUPERVISED_USERS" desc="Label for the button that opens the supervised users dashboard.">
     Manage supervised users
   </message>
-  <message name="IDS_SETTINGS_PEOPLE_MANAGE_SUPERVISED_USERS_DESCRIPTION" desc="Description for the button that opens the supervised users dashboard.">
-    Opens Supervised Users Dashboard
-  </message>
   <message name="IDS_SETTINGS_CHANGE_PICTURE_PROFILE_PHOTO" desc="The text on the Google profile photo of the user.">
     Google Profile photo
   </message>
 
   <if expr="chromeos">
     <message name="IDS_SETTINGS_PEOPLE_CONFIGURE_PIN_CHOOSE_PIN_TITLE" desc="Message shown below the title that tells the user to enter the initial PIN.">
       Enter your PIN
     </message>
     <message name="IDS_SETTINGS_PEOPLE_CONFIGURE_PIN_CONFIRM_PIN_TITLE" desc="Message shown below the title that tells the user to confirm their initial PIN entry.">
       Confirm your PIN
@@ skipping 734 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_LABEL" desc="Label for the control that opens a user's network proxy settings.">
       Open proxy settings
     </message>
   </if>
 </grit-part>