Fix doc build

NEWS.txt

-.. _NEWS:
-
 =============
 Release Notes
 =============
@@ -12,10 +10,12 @@ We recommend that everybody update to this version.
 Highlights:
 - Python 2 and 3 support with the same code base
 - Faster optimization
-- New GPU back-end
-   - Float16 new back-end (need cuda 7.5)
-   - Multi dtypes
-   - Multi-GPU support in the same process
+- New GPU back-end:
+
+   * Float16 new back-end (need cuda 7.5)
+   * Multi dtypes
+   * Multi-GPU support in the same process
+
 - Integration of CuDNN for better GPU performance
 - Many Scan improvements (execution speed up, ...)
 - optimizer=fast_compile moves computation to the GPU.