[UUF] Fix description of "Clear"

[gewarren]

• "Removes all items from the collection" -> "Clears all selections in the list view"
• And various other small improvements

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-collections

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

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[BillWagner]

This LGTM. Let's