docs: kvm: Convert s390-diag.txt to ReST format
This file is almost in ReST format. Just one change was needed: - Add markups for a literal block and change its indentation. While here, use the standard markup for the document title. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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