docs: fix grammar in feature request template

[claudeaceae]

Summary

This PR fixes grammatical errors in the feature request issue template.

Changes Made

Updated the markdown message in .github/ISSUE_TEMPLATE/feature_request.yml:

Before:

Please make sure that no duplicated issues has already been delivered.

After:

Please make sure that no duplicate issues have already been submitted.

Fixes

1. Subject-verb agreement: "issues has" → "issues have"
2. Word choice: "duplicated" → "duplicate" (more concise)
3. Terminology: "delivered" → "submitted" (more appropriate for GitHub issues)

Impact

This improves the professionalism and clarity of the feature request template, making it easier for contributors to understand the guidance.

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Note: Documentation-only change. No code modifications.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0173db9 and 020297b.

📒 Files selected for processing (1)

• .github/ISSUE_TEMPLATE/feature_request.yml

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