Update BrowsingDataLifetime policy description

Update policy description of BrowsingDataLifetime policy to make it more
informative while cutting down on the technical details and complexity.

Bug: 1163584
Change-Id: I2764fbf7651625667b9199136f17ea6dc709ae41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630865
Commit-Queue: Igor Ruvinov <igorruvinov@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844217}

components/policy/resources/policy_templates.json

@@ -24050,14 +24050,11 @@ If you disable this policy, web page scrolling to specific text fragments via UR
       'id': 791,
       'caption': 'Browsing Data Lifetime Settings',
       'tags': [],
-      'desc': '''Configures browsing data lifetime settings for <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>.
-      This policy controls the time to live of selected browsing data.
+      'desc': '''Configures browsing data lifetime settings for <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>. This policy allows admins to configure (per data-type) when data is deleted by <ph name="PRODUCT_NAME">$1<ex>Chrome</ex></ph>. This is useful for customers that work with sensitive customer data. The policy will only take effect if <ph name="SYNC_DISABLED_POLICY_NAME">SyncDisabled</ph> is set to true.
+
       The available data types are <ph name="DATA_TYPE_BROWSING_HISTORY">'browsing_history'</ph>, <ph name="DATA_TYPE_DOWNLOAD_HISTORY">'download_history'</ph>, <ph name="DATA_TYPE_COOKIES_AND_OTHER_SITE_DATA">'cookies_and_other_site_data'</ph>, <ph name="DATA_TYPE_CACHED_IMAGES_AND_FILES">'cached_images_and_files'</ph>, <ph name="DATA_TYPE_PASSWORD">'password_signin'</ph>, <ph name="DATA_TYPE_AUTOFILL">'autofill'</ph>, <ph name="DATA_TYPE_SITE_SETTINGS">'site_settings'</ph> and <ph name="DATA_TYPE_HOSTED_APP_DATA">'hosted_app_data'</ph>.
-      Chrome will regularly remove data of selected types that is older than <ph name="TIME_TO_LIVE_IN_HOURS">'time_to_live_in_hours'</ph>. As this deletion only happens in certain intervals, some data might live for slightly longer but never more than twice its expected <ph name="TIME_TO_LIVE_IN_HOURS">'time_to_live_in_hours'</ph>.
-      This policy requires the <ph name="SYNC_DISABLED_POLICY_NAME">SyncDisabled</ph> policy to be set to true, otherwise it will be ignored.
-      If this policy is set at platform level, Sync should be disabled at platform level.
-      If this policy is set at user level, Sync should be disabled for that user in order for this policy to take effect.
-      '''
+
+      <ph name="PRODUCT_NAME">$1<ex>Chrome</ex></ph> will automatically remove data of selected types that is older than <ph name="TIME_TO_LIVE_IN_HOURS">'time_to_live_in_hours'</ph>. The minimum value that can be set is 1 hour. In some rare cases the data may take longer to delete, but the data will eventually be deleted.'''
     },
     {
       'name': 'LacrosAllowed',