Fix several typos.

pkg/analyzer_cli/lib/src/options.dart

Index: pkg/analyzer_cli/lib/src/options.dart
diff --git a/pkg/analyzer_cli/lib/src/options.dart b/pkg/analyzer_cli/lib/src/options.dart
index 338aceeef39ef92c50c737da50280113427c020e..95122553b66725fdfbd8fbd5102827fd90271b8c 100644
--- a/pkg/analyzer_cli/lib/src/options.dart
+++ b/pkg/analyzer_cli/lib/src/options.dart
@@ -419,7 +419,7 @@ class CommandLineOptions {
           negatable: false,
           hide: hide)
       ..addFlag('color',
-          help: 'Use asni colors when printing messages.',
+          help: 'Use ansi colors when printing messages.',
           defaultsTo: ansi.terminalSupportsAnsi(),
           hide: hide);