date_core.c: [DOC] markdown to rdoc [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54721 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
date_core.c: [DOC] markdown to rdoc [ci skip]
documentation to RDoc from Markdown.
[ruby-core:75136] [Bug #12311]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54721 b2dd03c8-39d4-4d8f-98ff-823fe69b080e