Minor codegen tutorial update

Author: tbennun

tutorials/codegen.ipynb

@@ -519,6 +519,9 @@
     "        # We can get the map entry node from the scope graph\n",
     "        entry_node = scope.source_nodes()[0]\n",
     "        \n",
+    "        # First, generate an opening brace (for instrumentation and dynamic map ranges)\n",
+    "        callsite_stream.write('{', sdfg, state_id, entry_node)\n",
+    "        \n",
     "        ################################################################\n",
     "        # Generate specific code: We will generate a reversed loop with a \n",
     "        # comment for each dimension of the map. For the sake of simplicity,\n",