* ext/bigdecimal/bigdecimal.c: [DOC] several fixes by @chastell
  This includes fixing the capitalization of Infinity, return value of
  example "BigDecimal.new('NaN') == 0.0", and code style in example.
  [Fixes GH-398] https://github.com/ruby/ruby/pull/398


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43057 b2dd03c8-39d4-4d8f-98ff-823fe69b080e