fix: Update PR title prefix pattern in validating script

[Ahzyuan]

Prep Steps

Before we dive in, let's confirm you've unlocked all these steps

• 🔍 I've checked for duplicate PRs (click to check)
• 📜 I've followed contribution guidelines
  • ✨ I've linted and formatted my code (how?)
  • 🔧 I've formatted the PR title appropriately (how?)
  • 🎯 I've targeted the master branch (how?)
  • 👐 I've allowed maintainer edits on my branch (how? → See step 6)
• 🛡️ I've added/updated tests to cover my changes if prossible (how?)
• 📝 I've added/updated the documentation for any new logic introduced (how?)
• ⏳ I understand @Ahzyuan has been busy lately and may need time to review. (we appreciate your patience!)

Type of changes

• 🐞 Bug fix
• 🌟 New feature
• 🧪 Tests
• 🏗 Refactoring
• ⚡ Performance improvement
• 📖 Documentation / docstrings
• ↩️ Revert
• 🧩 Other

Description

Purpose

This PR is to update the PR title prefix pattern in the validating script to avoid misjudgement. Additionally, fix some remainent bugs(the coverage comment feature) in the compatibility test workflow that was modifiied by PR #32.

Changes:

• misc/validate_pr_title.sh: change doc to docs.
• .github/workflows/compatibility_test.yml: remove unnecessary condition in coverage comment step and add specific argument to ensure the comments are issued in the target PR.