Reword the summary text for Unknown sources in Security Settings

Don't use "non-Market" to describe unknown sources.

Bug: 6586626
Change-Id: I2ab440e9db1592ea8b398bd9466ff2f05ca5f6ce
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 13b4e56..dea5ccc 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -2330,7 +2330,7 @@
     <!-- Applications settings screen, setting check box title. If checked, the system allows installation of applications that are downloaded from random places, such as web sites.  -->
     <string name="install_applications">Unknown sources</string>
     <!-- Applications settings screen, setting check box summary.  This is the summary for "Unknown sources" checkbox  -->
-    <string name="install_unknown_applications">Allow installation of non-Market apps</string>
+    <string name="install_unknown_applications">Allow installation of apps from unknown sources</string>
     <!-- Applications settings screen, message text of alert that appears if user selects the "Unknown sources" check box -->
     <string name="install_all_warning" product="tablet">Your tablet and personal data are more vulnerable to attack by apps
  from unknown sources. You agree that you are solely responsible for any