Spelling fixes e to i.

pkg/front_end/lib/src/base/library_info.dart

 // Copyright (c) 2017, 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.
 
 /// A bit flag used by [LibraryInfo] indicating that a library is used by
 /// dart2js.
 ///
 /// This declaration duplicates the declaration in the SDK's "libraries.dart".
 const int DART2JS_PLATFORM = 1;
 
@@ skipping 18 matching lines @@
   return null;
 }
 
 /// The contexts that a library can be used from.
 ///
 /// This declaration duplicates the declaration in the SDK's "libraries.dart".
 enum Category {
   /// Indicates that a library can be used in a browser context.
   client,
 
-  /// Indicates that a lbirary can be used in a command line context.
+  /// Indicates that a library can be used in a command line context.
   server,
 
   /// Indicates that a library can be used from embedded devices.
   embedded
 }
 
 /// Information about a "dart:" library gleaned from the SDK's "libraries.dart"
 /// file.
 ///
 /// This declaration duplicates the declaration in "libraries.dart".
@@ skipping 100 matching lines @@
   final int level;
 
   final String name;
 
   final String description;
 
   const Maturity(this.level, this.name, this.description);
 
   String toString() => "$name: $level\n$description\n";
 }