few more fixes on the spec attack article
few more fixes on the spec attack article

NakamotoInstitute/nakamotoinstitute.org,NakamotoInstitute/nakamotoinstitute.org,NakamotoInstitute/nakamotoinstitute.org,NakamotoInstitute/nakamotoinstitute.org,NakamotoInstitute/nakamotoinstitute.org