[terra-data-grid] Update Worklist Data Grid Focusable Cell example

[sdadn]

Summary

This PR updates the column numbering on the Worklist Data Grid Focusable Cell example to be consistent with screenreader announcements.

Testing

This change was tested using:

• [ ] WDIO
• [ ] Jest
• [ ] Visual testing (please attach a screenshot or recording)
• [ ] Other (please describe below)
• [x] No tests are needed

Reviews

In addition to engineering reviews, this PR needs:

• [ ] UX review
• [x] Accessibility review
• [ ] Functional review

Additional Details

This PR resolves:

UXPLATFORM-XXXX

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Thank you for contributing to Terra. @cerner/terra

[mjpalazzo]

@sdadn - thanks for fixing the column header text. The JAWS announcements now match the visible text. Regarding the truncated focus indicator around the hyperlink in cell 4, 2. @cm9361 investigated the issue and determined that it should be fixed by the consumer by adding padding to the hyperlink control. See his comment in (https://jira2.cerner.com/browse/UXPLATFORM-10308). Would you consider fixing that in this PR or do we need a separate PR for that issue?

[sdadn]

@mjpalazzo I can get that fixed in this PR, thanks for the feedback!

[mjpalazzo]

@sdadn - Checking on the status of this PR. We know have an MPages Investigation Jira for it. https://jira2.cerner.com/browse/MPAGESCORE-91948

[sdadn]

This should be resolved in https://github.com/cerner/terra-framework/pull/2102.