Explain why we're using --format=json to get the extractor path

src/codeql.ts

@@ -650,6 +650,9 @@ export async function getCodeQLForCmd(
     async extractScannedLanguage(config: Config, language: Language) {
       const databasePath = util.getCodeQLDatabasePath(config, language);
       // Get extractor location
+      //
+      // Request it using `format=json` so we don't need to strip the trailing new line generated by
+      // the CLI.
       let extractorPath = "";
       await new toolrunner.ToolRunner(
         cmd,