Spelling fixes e to i.

pkg/analyzer/lib/plugin/options.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.
 
 /// Support for client code that wants to consume options contributed to the
 /// analysis options file.
 library analyzer.plugin.options;
 
 import 'package:analyzer/error/listener.dart';
 import 'package:yaml/yaml.dart';
 
 /// Validates options as defined in an analysis options file.
 ///
 /// The options file format is intentionally very open-ended, giving clients
-/// utmost flexibility in defining their own options.  The only hardfast
+/// utmost flexibility in defining their own options.  The only hard and fast
 /// expectation is that options files will contain a mapping from Strings
 /// (identifying 'scopes') to associated options.  For example, the given
 /// content
 ///
 ///     linter:
 ///       rules:
 ///         camel_case_types: true
 ///     compiler:
 ///       resolver:
 ///         useMultiPackage: true
@@ skipping 10 matching lines @@
 ///
 ///     bool useMultiPackage =
 ///         options['compiler']['resolver']['useMultiPackage'];
 ///
 /// Clients may implement this class when implementing plugins.
 ///
 abstract class OptionsValidator {
   /// Validate [options], reporting any errors to the given [reporter].
   void validate(ErrorReporter reporter, Map<String, YamlNode> options);
 }