Fix typo (rewriting comment).

lib/core/int.dart

Index: lib/core/int.dart
diff --git a/lib/core/int.dart b/lib/core/int.dart
index 9e3d5ec440f3816b7e01e7bafe9e24e1b3ef8208..b0f6c137e32451340e212d70d9ddbb43c740720c 100644
--- a/lib/core/int.dart
+++ b/lib/core/int.dart
@@ -47,16 +47,16 @@ abstract class int extends num {
   /** 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();
 
   /**