JavaScript: Fix duplicate comment

Author: tausbn

javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java

@@ -747,7 +747,7 @@ private CompletableFuture<?> extractSource() throws IOException {
         .filter(p -> !isFileTooLarge(p))
         .sorted(PATH_ORDERING)
         .collect(Collectors.toCollection(() -> new LinkedHashSet<>()));
-    // exclude files in output directories as configured in tsconfig.json
+    // gather all output directories specified in tsconfig.json files
     final List<Path> outDirs = new ArrayList<>();
     for (Path cfg : tsconfigFiles) {
       try {