Updated documentation of ShowAccessibilityOptionsInSystemTrayMenu policy

Change-Id: Icaf5588af67c8e3da50e7148dd57c4f0e63f93ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1706439Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678380}

components/policy/resources/policy_templates.json

@@ -9242,7 +9242,7 @@
 
           If this policy is left unset, Accessibility options will not appear in the system tray menu, but the user can cause the Accessibility options to appear via the Settings page.
 
-          When accessiblity features are enabled (by other means, e.g by a key combination), Accessibility options will always appear in system tray menu.'''
+          When accessiblity features are enabled by other means (e.g by a key combination), Accessibility options will always appear in system tray menu.'''
     },
     {
       'name': 'LargeCursorEnabled',