add table stylings to the styleguide
add table stylings to the styleguide

test plan:
  - make sure table stylings show up in the styleguide.

Change-Id: I69b420fdafce7a95ffc8cfb690539584c512c029
Reviewed-on: https://gerrit.instructure.com/22015
Reviewed-by: Ryan Florence <2d8900489f91ac272fd9ce9d5789db6522668ca2@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Product-Review: Stanley Stuart <2b43fb8b7a234825d50dd49ce7892d78a59da8f3@instructure.com>
QA-Review: Stanley Stuart <2b43fb8b7a234825d50dd49ce7892d78a59da8f3@instructure.com>

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