Fixing typos in policy_templates.

Change-Id: I4e1c979b9980c458b7f0de5eee4beae93d1888a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1848112
Auto-Submit: Adrian Taylor <adetaylor@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706164}

components/policy/resources/policy_templates.json

@@ -18334,13 +18334,13 @@
       'default_for_enterprise_users': True,
       'example_value': False,
       'id': 604,
-      'caption': '''Allows a page to perform synchronus XHR requests during page dismissal.''',
+      'caption': '''Allows a page to perform synchronous XHR requests during page dismissal.''',
       'tags': [],
-      'desc': '''This policy allows an admin to specify that a page may send synchronus XHR requests during page dismissal.
+      'desc': '''This policy allows an admin to specify that a page may send synchronous XHR requests during page dismissal.
 
-      When the policy is set to enabled, pages are allowed to send synchronus XHR reequests during page dismissal.
+      When the policy is set to enabled, pages are allowed to send synchronous XHR requests during page dismissal.
 
-      When the policy is set to disabled or not set, pages are not allowed to send synchronus XHR requests during page dismissal.
+      When the policy is set to disabled or not set, pages are not allowed to send synchronous XHR requests during page dismissal.
 
       This policy will be removed in Chrome 82.