Updated description for Managed Bookmarks policy.

components/policy/resources/policy_templates.json

 {
 # policy_templates.json - Metafile for policy templates
 #
 # The content of this file is evaluated as a Python expression.
 #
 # This file is used as input to generate the following policy templates:
 # ADM, ADMX+ADML, MCX/plist and html documentation.
 #
 # Policy templates are user interface definitions or documents about the
 # policies that can be used to configure Chrome. Each policy is a name-value
@@ skipping 7494 matching lines @@
         'ios:35-47',
         'chrome.*:37-',
         'chrome_os:37-',
       ],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,
       },
       'example_value': [
         {
+          "toplevel_name": "My managed bookmarks"
+        }, {
           "name": "Google",
           "url": "google.com"
         }, {
           "name": "Youtube",
           "url": "youtube.com"
         }, {
           "name": "Chrome links",
           "children": [
             {
               "name": "Chromium",
@@ skipping 18 matching lines @@
       name="URL">"url"</ph> key but with an additional <ph
       name="CHILDREN">"children"</ph> key which itself contains a list of
       bookmarks as defined above (some of which may be folders again). <ph
       name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> amends incomplete URLs
       as if they were submitted via the Omnibox, for example <ph
       name="GOOGLE_COM">"google.com"</ph> becomes <ph
       name="HTTPS_GOOGLE_COM">"https://google.com/"</ph>.
 
       These bookmarks are placed in a "Managed bookmarks" folder that can't be modified by the user, but the user can choose to hide it from the bookmark bar. Managed bookmarks are not synced to the user account and can't be modified by extensions.
 
-      The folder name for the bookmarks is customizable by adding a {"toplevel_name": "some name"} list item.''',
+      Starting with release 51, the folder name for the bookmarks is customizable by adding a {"toplevel_name": "some name"} list item.''',
     },
     {
       'name': 'DataCompressionProxyEnabled',
       'type': 'main',
       'schema': { 'type': 'boolean' },
       'supported_on': ['android:31-'],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,
       },
@@ skipping 1138 matching lines @@
       'desc': '''Text appended in parentheses next to the policies top-level container to indicate that those policies are of the Recommended level''',
       'text': 'Default Settings (users can override)',
     },
     'doc_complex_policies_on_windows': {
       'desc': '''Text pointing the user to a help article for complex policies on Windows''',
       'text': '''encoded as a JSON string, for details see <ph name="COMPLEX_POLICIES_URL">https://www.chromium.org/administrators/complex-policies-on-windows<ex>https://www.chromium.org/administrators/complex-policies-on-windows</ex></ph>''',
     },
   },
   'placeholders': [],
 }