Minor changes as per Christians most-recent review of the docs.

ppapi/api/pp_input_event.idl

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /**
  * This file defines the API used to handle mouse and keyboard input events.
  */
 
 /**
@@ skipping 49 matching lines @@
  */
 [assert_size(12)]
 struct PP_InputEvent_Character {
   /** A combination of the <code>PP_InputEvent_Modifier</code> flags. */
   uint32_t modifier;
 
   /**
    * This value represents the typed character as a single null-terminated UTF-8
    * character. Any unused bytes will be filled with null bytes. Since the
    * maximum UTF-8 character is 4 bytes, there will always be at least one null
-   * at the end so you can treat this as a null-termianted UTF-8 string.
+   * at the end so you can treat this as a null-terminated UTF-8 string.
    */
   char[5] text;
 };
 
 /**
  * The <code>PP_InputEvent_Mouse</code> struct represents all mouse events
  * except mouse wheel events.
  */
 [assert_size(20)]
 struct PP_InputEvent_Mouse {
@@ skipping 113 matching lines @@
   float_t wheel_ticks_y;
 
   /**
    * Indicates if the scroll <code>delta_x</code>/<code>delta_y</code>
    * indicates pages or lines to scroll by. When true, the user is requesting
    * to scroll by pages.
    */
   PP_Bool scroll_by_page;
 };