Issue #1807688 by Lars Toomre: small docs cleanup in book module

core/modules/book/book.admin.css

@@ -1,4 +1,3 @@
-
 /**
  * @file
  * Admin styles for book module.

core/modules/book/book.js

@@ -1,3 +1,9 @@
+/**
+ * @file
+ * Javascript behaviors for the Book module.
+ */
+
+
 (function ($) {
 
 "use strict";