[ci skip] Added example for date_field_tag method

actionview/lib/action_view/helpers/form_tag_helper.rb

@@ -614,6 +614,19 @@ def telephone_field_tag(name, value = nil, options = {})
       #
       # ==== Options
       # * Accepts the same options as text_field_tag.
+      #
+      # ==== Examples
+      #   date_field_tag 'name'
+      #   # => <input id="name" name="name" type="date" />
+      #
+      #   date_field_tag 'date', '01/01/2014'
+      #   # => <input id="date" name="date" type="date" value="01/01/2014" />
+      #
+      #   date_field_tag 'date', nil, class: 'special_input'
+      #   # => <input class="special_input" id="date" name="date" type="date" />
+      #
+      #   date_field_tag 'date', '01/01/2014', class: 'special_input', disabled: true
+      #   # => <input disabled="disabled" class="special_input" id="date" name="date" type="date" value="01/01/2014" />
       def date_field_tag(name, value = nil, options = {})
         text_field_tag(name, value, options.stringify_keys.update("type" => "date"))
       end