Improve documentation of Isolate.current.

sdk/lib/core/num.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.
 
 part of dart.core;
 
 /**
  * An integer or floating-point number.
  *
  * It is a compile-time error for any type other than [int] or [double]
@@ skipping 18 matching lines @@
    * If both operands are integers, they are equal if they have the same value.
    *
    * Returns false if `other` is not a [num].
    *
    * Notice that the behavior for NaN is non-reflexive. This means that
    * equality of double values is not a proper equality relation, as is
    * otherwise required of `operator==`. Using NaN in, e.g., a [HashSet]
    * will fail to work. The behavior is the standard IEEE-754 equality of
    * doubles.
    *
-   * If you can avoid NaN values, the remaining doubles do have a proper eqality
-   * relation, and can be used safely.
+   * If you can avoid NaN values, the remaining doubles do have a proper
+   * equality relation, and can be used safely.
    *
    * Use [compareTo] for a comparison that distinguishes zero and minus zero,
    * and that considers NaN values as equal.
    */
   bool operator==(Object other);
 
   /**
    * Returns a hash code for a numerical value.
    *
    * The hash code is compatible with equality. It returns the same value
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     result = double.parse(source, _returnDoubleNull);
     if (result != null) return result;
     if (onError == null) throw new FormatException(input);
     return onError(input);
   }
 
   /** Helper functions for [parse]. */
   static int _returnIntNull(String _) => null;
   static double _returnDoubleNull(String _) => null;
 }