Fix typo in SavingBrowserHistoryDisabled description

Change-Id: I995dae02a8823ce904f201501063e6a0526dab6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543922
Auto-Submit: Jit Yao Yap <jityao@google.com>
Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828174}

components/policy/resources/policy_templates.json

@@ -1795,7 +1795,7 @@
       'id': 11,
       'caption': '''Disable saving browser history''',
       'tags': [],
-      'desc': '''Setting the policy to Enabled means browsing history is not saved, tab syncing is off and, and users can't change this setting.
+      'desc': '''Setting the policy to Enabled means browsing history is not saved, tab syncing is off and users can't change this setting.
 
       Setting the policy to Disabled or leaving it unset saves browsing history.''',
     },