Merge pull request #13590 from kuldeepaggarwal/fix-date-helper-doc

provide correct example of `datetime_select` helper [ci skip]

actionview/lib/action_view/helpers/date_helper.rb

@@ -1066,7 +1066,7 @@ def time_select(method, options = {}, html_options = {})
       # Wraps ActionView::Helpers::DateHelper#datetime_select for form builders:
       #
       #   <%= form_for @person do |f| %>
-      #     <%= f.time_select :last_request_at %>
+      #     <%= f.datetime_select :last_request_at %>
       #     <%= f.submit %>
       #   <% end %>
       #