[PPAPI] Fix a bunch of spelling mistakes

ppapi/cpp/url_request_info.h

 // 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.
 
 #ifndef PPAPI_CPP_URL_REQUEST_INFO_H_
 #define PPAPI_CPP_URL_REQUEST_INFO_H_
 
 #include "ppapi/c/ppb_url_request_info.h"
 #include "ppapi/cpp/resource.h"
 #include "ppapi/cpp/var.h"
@@ skipping 112 matching lines @@
   /// @return true if successful, false if the parameter is invalid.
   bool SetMethod(const Var& method_string) {
     return SetProperty(PP_URLREQUESTPROPERTY_METHOD, method_string);
   }
 
   /// SetHeaders() sets the <code>PP_URLREQUESTPROPERTY_HEADERS</code>
   /// (corresponding to a <code>\n</code> delimited string of type
   /// <code>PP_VARTYPE_STRING</code>) property for the request.
   /// Refer to the
   /// <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html"Header
-  /// Field Definitions</a> documentaiton for further information.
+  /// Field Definitions</a> documentation for further information.
   ///
   /// @param[in] headers_string A <code>Var</code> containing the property
   /// value.
   ///
   /// @return true if successful, false if the parameter is invalid.
   bool SetHeaders(const Var& headers_string) {
     return SetProperty(PP_URLREQUESTPROPERTY_HEADERS, headers_string);
   }
 
   /// SetStreamToFile() sets the
@@ skipping 181 matching lines @@
   ///
   /// @return true if successful, false if the parameter is invalid.
   bool SetCustomUserAgent(const Var& user_agent) {
     return SetProperty(PP_URLREQUESTPROPERTY_CUSTOMUSERAGENT, user_agent);
   }
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_URL_REQUEST_INFO_H_