[PPAPI] Fix a bunch of spelling mistakes

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 36 matching lines @@
  * a '%'. The key down and up events will give you the scan code for the "5"
  * key, and the character event will give you the '%' character.
  *
  * You may not get a character event for all key down events if the key doesn't
  * generate a character. Likewise, you may actually get multiple character
  * events in a row. For example, some locales have an accent key that modifies
  * the next character typed. You might get this stream of events: accent down,
  * accent up (it didn't generate a character), letter key down, letter with
  * accent character event (it was modified by the previous accent key), letter
  * key up.  If the letter can't be combined with the accent, like an umlaut and
- * an 'R', the system might send unlaut down, umlaut up, 'R' key down, umlaut
- * character (can't combine it with 'R', so just send the raw unlaut so it
+ * an 'R', the system might send umlaut down, umlaut up, 'R' key down, umlaut
+ * character (can't combine it with 'R', so just send the raw umlaut so it
  * isn't lost"), 'R' character event, 'R' key up.
  */
 [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
@@ skipping 125 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;
 };