docs(TextInput): Expand accessibility guidance for AI codegen

[williamjstanton]

Summary

Expands TextInput Storybook Accessibility docs to the AI-codegen template used by FormField, Dialog, and TextArea, and makes small TextArea wording/prop-name sync fixes so the two stay consistent.

Release Category

Documentation

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Checklist

• MDX documentation adheres to Canvas Kit's Documentation Guidelines
• Label ready for review has been added to PR

For the Reviewer

• PR title is short and descriptive
• PR summary describes the change (Fixes/Resolves linked correctly)
• PR Release Notes describes additional information useful to call out in a release message or removed if not applicable
• Breaking Changes provides useful information to upgrade to this code or removed if not applicable

Where Should the Reviewer Start?

1. modules/react/text-input/stories/TextInput.mdx — new Accessibility section (Minimum structure → Built-in Behaviors → Requirements → Anti-Patterns)
2. Compare structure/wording against modules/react/text-area/stories/TextArea.mdx (shared skeleton; TextInput-only deltas for InputGroup, autoComplete, and type)
3. Usage updates in TextInput (isRequired, Icons label-association note, icon role="presentation" note)

Areas for Feedback? (optional)

• Code
• Documentation
• Testing
• Codemods

Please focus on:

• Accuracy of InputGroup + FormField wiring (FormField.Field as={InputGroup} + hoisted id)
• Whether Built-in Behaviors vs Requirements vs Anti-Patterns split is clear for codegen
• Parity with TextArea (lean Keyboard section; no redundant standard HTML bullets)

Testing Manually

1. Run Storybook (yarn start) and open Components → Inputs → Text Input → Docs
2. Confirm the Accessibility section renders (code blocks, tables, kbd, links)
3. Spot-check cross-links: FormField Accessibility, TextArea, Icons / Ref Forwarding anchors, WCAG Identify Input Purpose
4. Optionally open Text Area Docs and confirm shared section structure still matches

Screenshots or GIFs (if applicable)

N/A — documentation-only

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[purvas12]

Left one minor comment in the Usage section for Text Input. Looks good to me otherwise.

[cypress]

Workday/canvas-kit    Run #11539

Run Properties:   Passed #11539  •  4a7242d5b2 ℹ️: Merge ea1d710bd4937fb9d390c34c46b045e3f17249bd into b8ad758804ebe906bec1f925d922...

Project	Workday/canvas-kit
Branch Review	william-aidocs-textinput
Run status	Passed #11539
Run duration	03m 08s
Commit	4a7242d5b2 ℹ️: Merge ea1d710bd4937fb9d390c34c46b045e3f17249bd into b8ad758804ebe906bec1f925d922...
Committer	William Stanton
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	17
Skipped	0
Passing	812
View all changes introduced in this branch ↗︎

UI Coverage  19.51%
Untested elements	1537
Tested elements	370

Accessibility  99.47%
Failed rules	5 critical   5 serious   0 moderate   2 minor
Failed elements	72