yaml/api.c: fix typo
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44918 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
yaml/api.c: fix typo
with 'emitter'.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44918 b2dd03c8-39d4-4d8f-98ff-823fe69b080e