merge revision(s) 54444: [Backport #12233]
* ext/date/date_core.c (Init_date_core): [DOC] fix misplaced doc of DateTime. [ruby-core:74729] [Bug #12233]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 54444: [Backport #12233]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e