Improve comment on hack in header.js

Author: rubensworks

lib/header.js

@@ -46,7 +46,7 @@ async function linksHandler (req, res, next) {
   let filename
   try {
     // Hack: createIfNotExists is set to true for PUT or PATCH requests
-    // because the file does not exist yet at this point.
+    // because the file might not exist yet at this point.
     // But it will be created afterwards.
     // This should be improved with the new server architecture.
     ({ path: filename } = await ldp.resourceMapper