Fix hidden table description text on new notifications page shows in IE8. closes #9655
Fix hidden table description text on new notifications page shows in IE8. closes #9655

Testing notes:
* using IE, visit the /profile/notifications page and verify that the
  table caption does not display.

Change-Id: I6c9c5cac38380f07eae00ff12487d4173c1d0a51
Reviewed-on: https://gerrit.instructure.com/12561
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>

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