Fix formatting

README.rst

@@ -57,6 +57,7 @@ Tested environments
 ^^^^^^^^^^^^^^^^^^^
 
 Operating systems
+
 * Ubuntu 18.04.5 LTS , with `CUDA Toolkit 10.1`_, gcc 7.5.0 as C++ compiler.
 
 * Windows 10, with `CUDA Toolkit 11.3`_ and `Visual Studio 2019`_ for C++ compiler.
@@ -119,4 +120,4 @@ Supported by `Wellcome`_ and `EPSRC`_.
 .. _`Visual Studio 2019`: https://learn.microsoft.com/en-us/visualstudio/releases/2019/release-notes
 .. _`CUDA Toolkit 11.3`: https://developer.nvidia.com/cuda-11.3.0-download-archive?target_os=Windows&target_arch=x86_64&target_version=10&target_type=exe_local
 .. _`CUDA Toolkit 10.1`: https://developer.nvidia.com/cuda-10.1-download-archive-base?target_os=Linux&target_arch=x86_64&target_distro=Ubuntu&target_version=1804&target_type=runfilelocal
-.. _`CUDA on WSL`: https://docs.nvidia.com/cuda/wsl-user-guide/index.html
+.. _`CUDA on WSL`: https://docs.nvidia.com/cuda/wsl-user-guide/index.html