message: Update Insertion_sort_list.cpp
diff: @@ -47,7 +47,7 @@ public:
  node->next = head;
  return node;
  }
  - ListNode *current = head;
  + ListNode *curr = head;
  while(curr->next) {
  if(curr->next->val >= node->val) {
  node->next = curr->next;
  