Auto merge of #8024 - tareqak:warning_message_about_os_x_notifications_is_unclear, r=frewsxcv
Auto merge of #8024 - tareqak:warning_message_about_os_x_notifications_is_unclear, r=frewsxcv

Add clarity to warning message about OS X notifications

I made this change with respect to this issue: https://github.com/servo/servo/issues/7840

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