bigdecimal.c: fix a typo
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49491 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
bigdecimal.c: fix a typo
to 'exponent'. [ruby-core:67980] [Bug #10823] [Fix GH-825]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49491 b2dd03c8-39d4-4d8f-98ff-823fe69b080e