JS: Update test output and add related TODO in 'markdown-table' model

javascript/ql/lib/semmle/javascript/frameworks/Markdown.qll

@@ -52,6 +52,7 @@ module Markdown {
   private class MarkdownTableStep extends MarkdownStep {
     override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
       exists(DataFlow::CallNode call | call = DataFlow::moduleImport("markdown-table").getACall() |
+        // TODO: needs a flow summary to ensure ArrayElement content is unfolded
         succ = call and
         pred = call.getArgument(0)
       )