Fix typo (rewriting comment).

lib/core/int.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Representation of Dart integers containing integer specific
  * operations and specialization of operations inherited from [num].
  *
  * Integers can be arbitrarily large in Dart.
  *
@@ skipping 29 matching lines @@
 
   /** Returns true if and only if this integer is odd. */
   bool get isOdd;
 
   /** Negate operator. Negating an integer produces an integer. */
   int operator -();
 
   /** Returns the absolute value of this integer. */
   int abs();
 
-  /** For integers the round method is the identify function. */
+  /** Returns [this]. */
   int round();
 
-  /** For integers the floor method is the identify function. */
+  /** Returns [this]. */
   int floor();
 
-  /** For integers the ceil method is the identify function. */
+  /** Returns [this]. */
   int ceil();
 
-  /** For integers the truncate method is the identify function. */
+  /** Returns [this]. */
   int truncate();
 
   /**
    * Returns a representation of this [int] value.
    *
    * It should always be the case that if [:i:] is an [int] value,
    * then [:i == int.parse(i.toString()):].
    */
   String toString();
 
   /**
    * Parse [source] as an integer literal and return its value.
    *
    * Accepts "0x" prefix for hexadecimal numbers, otherwise defaults
    * to base-10.
    *
    * Throws a [FormatException] if [source] is not a valid integer literal.
    */
   external static int parse(String source);
 }