Andrew Pheasey contributed to the spatie/php-operators.com repository by addressing a documentation bug related to string interpolation examples. He identified that the existing Markdown code snippet did not accurately reflect the actual output, which could lead to confusion for readers. By updating the documentation, Andrew ensured that the example output matched the expected behavior, adding necessary punctuation and clarifying the explanation. His work involved careful content updates and adherence to documentation standards, utilizing both Markdown and PHP to maintain clarity and consistency. This fix improved the overall quality of the documentation, making it more reliable and easier for users to understand.