drm/radeon: Improve vramlimit module param documentation
drm/radeon: Improve vramlimit module param documentation

Signed-off-by: Lauri Kasanen <fbaa1710f5685e9772d76f549035a0a3df1c04aa@gmx.com>
Signed-off-by: Christian König <c7ea837d7a46effe4232b086213468b8b31643bf@amd.com>
Reviewed-by: Alex Deucher <08dc22c6156113f2deff178e35e3ed9b24d6af9e@amd.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs