Improve readme

README.rst

@@ -161,12 +161,13 @@ The ``mpsd-software-manager`` python package.
 
   - Please check https://spack.readthedocs.io/en/latest/getting_started.html#system-prerequisites
 
+- The installation is only expected to work for x86 architectures at the moment.
 
 Requirements for particular toolchains and package sets
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 - ``foss*-serial`` should compile with the dependencies outlined above
-- ``foss*-mpi`` currently needs linux header files installed (to compile the ``kmem`` package)
+- ``foss*-mpi`` currently needs linux header files installed (to compile the ``knem`` package)
 - ``foss*-cuda-mpi`` (proably as `*-mpi, needs testing TODO)