Revert "Update BrowsingDataLifetime policy description"

This reverts commit 70b75301.

Reason for revert: Incorrect multiple uses of PRODUCT_NAME (crbug.com/1168172)

Original change's description:
> 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}

TBR=pastarmovj@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,igorruvinov@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1163584
Change-Id: I80834322e3715c917da54015b70b211d3d70feb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637582Reviewed-by: Ben Mason <benmason@chromium.org>
Commit-Queue: Ben Mason <benmason@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844841}

components/policy/resources/policy_templates.json

@@ -24095,11 +24095,14 @@ 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 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.
-
+      '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.
       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>.
-
-      <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.'''
+      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.
+      '''
     },
     {
       'name': 'LacrosAllowed',