[fullscreen] 更新漏れ（文献

Author: triple-underscore

fullscreen-ja.html

@@ -424,7 +424,7 @@
 [CSS]
     Bert Bos; et al. ＜Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification＞. URL: https://drafts.csswg.org/css2/
 [CSS-POSITION-4]
-    ＜CSS Positioned Layout Module Level 4＞. Editor's Draft. URL: https://drafts.csswg.org/css-position-4/
+    ＜CSS Positioned Layout Module Level 4＞. URL: https://drafts.csswg.org/css-position-4/
 [DOM]
     Anne van Kesteren. ＜DOM Standard＞. Living Standard. URL: https://dom.spec.whatwg.org/
 [HTML]