servo: Merge #2952 - Update fragment.rs doc comment with new type name (Box -> Fragment) (from mbrubeck:fragment-comment)

Source-Repo: https://github.com/servo/servo
Source-Revision: 731e0b4df68b42972a8c8265fa467069691c4b46

servo/src/components/layout/fragment.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-//! The `Box` type, which represents the leaves of the layout tree.
+//! The `Fragment` type, which represents the leaves of the layout tree.
 
 #![deny(unsafe_block)]