Fix typo in policy description

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 7509 matching lines @@
       'supported_on': ['chrome_os:38-'],
       'features': {
         'can_be_recommended': True,
         'dynamic_refresh': True,
         'per_profile': True,
       },
       'example_value': ['de', 'fr'],
       'id': 274,
       'caption': '''Set the recommended locales for a public session''',
       'tags': [],
-      'desc': '''Sets one or more recommended locales for a public sessions, allowing users to easily choose one of these locales.
+      'desc': '''Sets one or more recommended locales for a public session, allowing users to easily choose one of these locales.
 
       The user can choose a locale and a keyboard layout before starting a public session. By default, all locales supported by <ph name="PRODUCT_OS_NAME">$2<ex>Google Chrome OS</ex></ph> are listed in alphabetic order. You can use this policy to move a set of recommended locales to the top of the list.
 
       If this policy is not set, the current UI locale will be pre-selected.
 
       If this policy is set, the recommended locales will be moved to the top of the list and will be visually separated from all other locales. The recommended locales will be listed in the order in which they appear in the policy. The first recommended locale will be pre-selected.
 
       If there is more than one recommended locale, it is assumed that users will want to select among these locales. Locale and keyboard layout selection will be prominently offered when starting a public session. Otherwise, it is assumed that most users will want to use the pre-selected locale. Locale and keyboard layout selection will be less prominently offered when starting a public session.
 
       When this policy is set and automatic login is enabled (see the |DeviceLocalAccountAutoLoginId| and |DeviceLocalAccountAutoLoginDelay| policies), the automatically started public session will use the first recommended locale and the most popular keyboard layout matching this locale.
@@ skipping 483 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': [],
 }