[MD settings] inform users that the spelling service sends data to google

chrome/app/settings_strings.grdp

Index: chrome/app/settings_strings.grdp
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index dc3b1eb70987e663e9ebeef0b3605cf7cc22bd77..0f6574bed9601a51b3ac014a6abba2e650bd928b 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -1469,6 +1469,9 @@
   <message name="IDS_SETTINGS_SPELLING_PREF" desc="The documentation string of the 'Use Spelling' preference">
     Use a web service to help resolve spelling errors
   </message>
+  <message name="IDS_SETTINGS_SPELLING_DESCRIPTION" desc="Description of using a web serviced to help resolve spelling errors. It is important to convey that what the user types will be sent to Google.">
+    Smarter spell-checking by sending what you type in the browser to Google
+  </message>
   <message name="IDS_SETTINGS_ENABLE_LOGGING" desc="The label of the checkbox to enable/disable crash and user metrics logging">
     Automatically send usage statistics and crash reports to Google
   </message>