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

lib/codeql.js

@@ -367,6 +367,9 @@ async function getCodeQLForCmd(cmd, checkVersion) {
         async extractScannedLanguage(config, 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, [
                 "resolve",