Update description for DeviceMetricsReportingEnabled

Bug: 1018157
Change-Id: Ia4d5e4f1e09e5fa659c09b0eb68406b566e8a6eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435665Reviewed-by: Drew Wilson <atwilson@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811718}

components/policy/resources/policy_templates.json

@@ -9348,14 +9348,9 @@
         'admin-sharing',
         'google-sharing',
       ],
-      'desc': '''Controls whether usage metrics and diagnostic data, including crash reports, are reported back to Google.
-
-      If set to true, <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> will report usage metrics and diagnostic data.
-
-      If set to false, metrics and diagnostic data reporting will be disabled.
-
-      If not configured, metrics and diagnostic data reporting will be disabled on unmanaged devices and enabled on managed devices.''',
+      'desc': '''Setting the policy to Enabled has <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> report usage metrics and diagnostic data, including crash reports, back to Google. Setting the policy to Disabled turns off metrics and diagnostic data reporting.
 
+       Leaving the policy unset keeps metrics and diagnostic data reporting off on unmanaged devices and on for managed devices.''',
       'arc_support': 'This policy also controls Android usage and diagnostic data collection.',
     },
     {