docs: update README_JA.md

[eltociear]

minor fix

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Important

Fix incorrect character in section header of README_JA.md.

• Documentation:
  • Fix incorrect character in section header from # ��️ なぜ PySpur なのか？ to # 🕸️ なぜ PySpur なのか？ in README_JA.md.
  • Ensure consistent use of emoji in section headers.

^{This description was created by for d0420a0. It will automatically update as commits are pushed.}

[ellipsis-dev]

👍 Looks good to me! Reviewed everything up to d0420a0 in 43 seconds

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• Looked at 20 lines of code in 1 files
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• Skipped posting 4 drafted comments based on config settings.

1. README_JA.md:32

• Draft comment:
  Corrected emoji display (from '��️' to '🕸️'); this improves clarity.
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 0% <= threshold 50%
  This comment is purely informative, as it only states what was changed without providing any actionable feedback or suggestions. It doesn't ask for confirmation or suggest improvements, so it should be removed according to the rules.

2. README_JA.md:145

• Draft comment:
  Added newline at EOF for consistency.
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 0% <= threshold 50%
  This comment is purely informative and does not provide any actionable feedback or suggestions. It simply states that a newline was added at the end of the file for consistency, which does not require any action from the PR author.

3. README_JA.md:31

• Draft comment:
  Emoji encoding fix: replaced corrupted '��️' with correct spider web emoji '🕸️' in header.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50%
  None

4. README_JA.md:145

• Draft comment:
  Trailing newline added at end-of-file (best practice).
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50%
  None

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[srijanpatel]

Thanks a lot for the PR! LGTM