Update README.md

Author: Bashamega

README.md

@@ -83,7 +83,6 @@ If you are familiar with Web IDL, you may also want to check whether the upstrea
 
 ## Input Files
 
-- `mdn/apiDescriptions.json`: a JSON file generated by fetching API descriptions from [MDN](https://developer.mozilla.org/en-US/docs/Web/API). **Do not edit this file**.
 - `addedTypes.jsonc`: types that should exist but are missing from the spec data.
 - `overridingTypes.jsonc`: types that are defined in the spec but have TypeScript-friendly modifications in the json files.
 - `removedTypes.jsonc`: types that are defined in the spec but should be removed.