Issue #3582410: Add WCAG 1.3.1 scope attributes to Tablefield table headers

Nicholas Steesrequested to merge
issue/tablefield-3582410:3582410-add-wcag-1.3.1 into 8.x-2.x

Issue #3582410: Add WCAG scope attributes to Table Field for Acquia Web Governance Scanner.

Closes #3582410

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