Nice work :) A few comments:
- "Get Request " should be "Get request".
- Update the MediaWiki version that this API can be used in.
- Trim down the response to a few lines.
- There's some grammatical errors in your "Additional notes" paragraph like missing periods at the end of a sentence and missing a space between the end of a sentence and the beginning of another. You may use Grammarly to check for grammatical errors. In the same paragraph, use <code> tags instead of "double quotes" if you are referring to a variable or something like the text of a button.