fix(FlagIcon): Replace FlagIcon with RhUiFlagFillIcon

[rebeccaalpert]

What:
This is one piece of #12400. Breaking it up by icon so it is easier to review.

Additional issues:

Summary by CodeRabbit

• Documentation
  • Updated DescriptionList component examples to use an improved flag icon variant in the documentation and example implementations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c30b4aa3-7d92-4055-bcfa-13f5bbbc179a

📥 Commits

Reviewing files that changed from the base of the PR and between 8b528bb and fdf5bdc.

📒 Files selected for processing (2)

• packages/react-core/src/components/DescriptionList/examples/DescriptionList.md
• packages/react-core/src/components/DescriptionList/examples/DescriptionListIconsOnTerms.tsx

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Walkthrough

The PR updates DescriptionList example files to replace FlagIcon with RhUiFlagFillIcon from PatternFly React Icons. The icon import is updated in the example metadata documentation and in the example component's import statement and rendering logic.

Changes

Icon replacement in examples

Layer / File(s)	Summary
Icon import and usage update packages/react-core/src/components/DescriptionList/examples/DescriptionList.md, packages/react-core/src/components/DescriptionList/examples/DescriptionListIconsOnTerms.tsx	Example metadata and component imports are updated to add RhUiFlagFillIcon, and the "Annotation" term rendering is updated to use the new icon instead of FlagIcon.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested labels

Needs design review

Suggested reviewers

• nicolethoen
• kmcfaul
• thatblindgeye

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically identifies the main change: replacing FlagIcon with RhUiFlagFillIcon across the codebase, which aligns with the actual modifications shown in both the example file and component file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[patternfly-build]

Preview: https://pf-react-pr-12457.surge.sh

A11y report: https://pf-react-pr-12457-a11y.surge.sh