fix typo

Author: andishgar

cpp/src/arrow/sparse_tensor.h

@@ -592,8 +592,6 @@ class SparseTensorImpl : public SparseTensor {
     ARROW_RETURN_NOT_OK(internal::MakeSparseTensorFromTensor(
         tensor, SparseIndexType::format_id, index_value_type, pool, &sparse_index,
         &data));
-    // TODO CHECK SparseTensorCreation.
-
     return std::make_shared<SparseTensorImpl<SparseIndexType>>(
         internal::checked_pointer_cast<SparseIndexType>(sparse_index), tensor.type(),
         data, tensor.shape(), tensor.dim_names_);

cpp/src/arrow/util/sparse_tensor_util.h

@@ -73,6 +73,7 @@ struct IndexPointerVisitor {
                              ". Expected integer.");
   }
 };
+
 }  // namespace detail
 
 template <typename Function>