pkg/shelf: spelling fixes

lib/src/handlers/logger.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library shelf.handlers.logger;
 
 import 'package:stack_trace/stack_trace.dart';
 
 import '../hijack_exception.dart';
 import '../middleware.dart';
 import '../util.dart';
 
 /// Middleware which prints the time of the request, the elapsed time for the
 /// inner handlers, the response's status code and the request URI.
 ///
-/// [logger] takes two paramaters.
+/// [logger] takes two parameters.
 ///
 /// `msg` includes the request time, duration, request method, and requested
 /// path.
 ///
 /// For successful requests, `msg` also includes the status code.
 ///
 /// When an error is thrown, `isError` is true and `msg` contains the error
 /// description and stack trace.
 Middleware logRequests({void logger(String msg, bool isError)}) =>
     (innerHandler) {
@@ skipping 44 matching lines @@
   return '$msg\n$chain';
 }
 
 void _defaultLogger(String msg, bool isError) {
   if (isError) {
     print('[ERROR] $msg');
   } else {
     print(msg);
   }
 }