date_core.c: [DOC] revise docs [ci skip]
* fix malformed rdoc for Date#today, Date._strptime,
and DateTime._strptime
* add code examples for Date#<< and Date#>> to demonstrate
that different dates can result in the same return value
* use Date::ITALY in call-seq instead of only ITALY
* fix some copy/paste mistakes where Date should be DateTime
* fix various errors and grammar
* fix cross references and formatting
[ruby-core:79433] [Bug #13193]
Author: Marcus Stollsteimer <sto.mar@web.de>
Added by usa (Usaku NAKAMURA) about 7 years ago
merge revision(s) 57549: [Backport #13193]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@58101 b2dd03c8-39d4-4d8f-98ff-823fe69b080e