NAIROBI, Oct 28 (Reuters) – – The following company announcements, scheduled economic indicators, debt and currency market moves and political events may affect African markets on Tuesday. – – – – – EVENTS: BOTSWANA-Bank of Botswana may announce its latest decision on benchmark lending rate. SOUTH AFRICA – South Africa’s Treasury auctions 2.35 billion rand of its 2030, 2032 and 2048 bonds GLOBAL MARKETS Asian shares were modestly higher while the dollar held steady on Tuesday, as i