Update PR template

[masutaka]

PR Type

🤖 Generated by PR Agent at 844974e

['Documentation']

PR Description

🤖 Generated by PR Agent at 844974e

• Updated PR template section titles for clarity.
• Simplified instructions for mentioning related issues.
• Reorganized and renamed sections for better readability.

PR Walkthrough

	Relevant files
Documentation	pull_request_template.md Updated and reorganized PR template sections                          .github/pull_request_template.md Renamed "PR Description" to "Description". Renamed "PR Walkthrough" to "Changes walkthrough 📝". Simplified instructions for related issue mentions. Removed "Testing" and adjusted "Other Information" section. +4/-8

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⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

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