* ext/dbm/dbm.c: [DOC] Fix wrong constant name in DBM by @edward
  [Fixes GH-409] https://github.com/ruby/ruby/pull/409


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43141 b2dd03c8-39d4-4d8f-98ff-823fe69b080e