spec: add tiny-mce link button check
spec: add tiny-mce link button check

Change-Id: I081f09a4f8ecd78c56303b257a76f3d44ba8c7c0
Reviewed-on: https://gerrit.instructure.com/68267
Reviewed-by: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Tested-by: Jenkins
Product-Review: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
QA-Review: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>

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