* ext/bigdecimal/bigdecimal.gemspec: Update authors


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41308 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* ext/bigdecimal/bigdecimal.c: Update overview formatting of headers


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41309 b2dd03c8-39d4-4d8f-98ff-823fe69b080e