Tweaks to the analysis server --help output.

pkg/analysis_server/benchmark/perf/analysis_timing_tests.dart

 // Copyright (c) 2015, 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 server.performance.analysis.timing;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
@@ skipping 43 matching lines @@
 String source;
 
 ArgParser _createArgParser() => new ArgParser()
   ..addOption(METRIC_NAME_OPTION,
       help: 'metric name (defaults to `analysis`)', allowMultiple: true)
   ..addOption(SOURCE_OPTION, help: 'full path to source directory for analysis')
   ..addOption(PRIORITY_FILE_OPTION,
       help: '(optional) full path to a priority file');
 
 /**
- * AnalysisTimingTest measures the time taken by the analsyis server to fully analyze
+ * AnalysisTimingTest measures the time taken by the analysis server to fully analyze
  * the given directory. Measurement is started after setting the analysis root, and
  * analysis is considered complete on receiving the `"isAnalyzing": false` message
  * from the analysis server.
  */
 class AnalysisTimingTest extends AbstractTimingTest {
   Future test_timing() async {
     // Set root after subscribing to avoid empty notifications.
     await init(source);
 
     setAnalysisRoot();
@@ skipping 79 matching lines @@
 
     sendAnalysisSetPriorityFiles([priorityFile]);
 
     await analysisFinished;
     print('analysis completed in ${stopwatch.elapsed}');
     metrics.forEach((Metric m) => print('${m.name} timings: ${m.timings}'));
 
     await shutdown();
   }
 }