fix(field-input-purpose): replace email address with proper placeholder

[cdransf]

Description

Updated the field-label documentation's Anatomy section example to use "Product name" instead of "Email address" to avoid using personal data fields in examples.

Motivation and context

The Email address field example violated WCAG 2.2 criterion 1.3.5 (Identify Input Purpose - Level AA) by using a personal data field without an autocomplete attribute. Rather than adding autocomplete to documentation examples, we changed to a non-personal data field ("Product name") which doesn't require autocomplete attributes.

This improves accessibility compliance in our documentation and provides a more universally applicable example.

Related issue(s)

SWC-1167

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Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have included updated documentation if my change required it.

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Reviewer's checklist

Manual review test cases

• Verify documentation renders correctly
  1. Navigate to https://opensource.adobe.com/spectrum-web-components/components/field-label/#anatomy
  2. Verify the Anatomy section shows "Product name" field instead of "Email address"
  3. Confirm the example displays correctly with placeholder "Enter product name"

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[github-actions]

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[github-actions]

📚 Branch Preview Links

• Documentation Site (first-gen)
• Storybook (first-gen)
• Storybook (second-gen)

🔍 First Generation Visual Regression Test Results

When a visual regression test fails (or has previously failed while working on this branch), its results can be found in the following URLs:

• Spectrum | Light | Medium | LTR
• Spectrum | Dark | Large | RTL
• Express | Light | Medium | LTR
• Express | Dark | Large | RTL
• Spectrum-two | Light | Medium | LTR
• Spectrum-two | Dark | Large | RTL
• High Contrast Mode | Medium | LTR

Deployed to Azure Blob Storage: pr-5880

If the changes are expected, update the current_golden_images_cache hash in the circleci config to accept the new images. Instructions are included in that file.
If the changes are unexpected, you can investigate the cause of the differences and update the code accordingly.