fix documentation for ALPHANUM and PROTEIN alphabets (they take upper case chars not lowercase)
fix documentation for ALPHANUM and PROTEIN alphabets (they take upper
case chars not lowercase)

lambday/shogun,shogun-toolbox/shogun,besser82/shogun,shogun-toolbox/shogun,Saurabh7/shogun,lisitsyn/shogun,karlnapf/shogun,lambday/shogun,Saurabh7/shogun,lambday/shogun,lisitsyn/shogun,geektoni/shogun,geektoni/shogun,lisitsyn/shogun,shogun-toolbox/shogun,shogun-toolbox/shogun,sorig/shogun,lisitsyn/shogun,besser82/shogun,geektoni/shogun,Saurabh7/shogun,Saurabh7/shogun,lambday/shogun,sorig/shogun,karlnapf/shogun,Saurabh7/shogun,lambday/shogun,Saurabh7/shogun,lisitsyn/shogun,geektoni/shogun,geektoni/shogun,sorig/shogun,shogun-toolbox/shogun,Saurabh7/shogun,Saurabh7/shogun,geektoni/shogun,karlnapf/shogun,lambday/shogun,sorig/shogun,Saurabh7/shogun,karlnapf/shogun,besser82/shogun,karlnapf/shogun,besser82/shogun,lisitsyn/shogun,sorig/shogun,sorig/shogun,besser82/shogun,karlnapf/shogun,besser82/shogun,shogun-toolbox/shogun