fix issues mentioned by rstcheck

README.rst

@@ -183,7 +183,7 @@ 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 ``knem`` package)
-- ``foss*-cuda-mpi`` (proably as `*-mpi, needs testing TODO)
+- ``foss*-cuda-mpi`` (proably as `*-mpi, needs testing TODO`)
 
 
 Working example