Fix documentation Markdown and text typos

[ahirpravin]

Description

Fix two documentation issues in the Optimization Detective documentation.

Changes

• Fix the mismatched Markdown code fence in plugins/optimization-detective/docs/hooks.md at line 81 by changing the closing delimiter from four backticks to three.

• Fix the typo in plugins/optimization-detective/docs/introduction.md at line 461 by changing no to not in the image description.

Files Changed

• plugins/optimization-detective/docs/hooks.md — line 81
• plugins/optimization-detective/docs/introduction.md — line 461

Testing

• Reviewed the Markdown syntax and corrected the code fence delimiter.
• Reviewed the affected documentation text and corrected the reported typo.

[github-actions]

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Co-authored-by: ahirpravin <pravin1996@git.wordpress.org>

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