Improve documentation of Isolate.current.

sdk/lib/core/num.dart

Index: sdk/lib/core/num.dart
diff --git a/sdk/lib/core/num.dart b/sdk/lib/core/num.dart
index 83b49251b03d75aac7bc26ac1cb8952caf20fd50..3d59c752e9fc006941f80c585bb3be651d2b193b 100644
--- a/sdk/lib/core/num.dart
+++ b/sdk/lib/core/num.dart
@@ -36,8 +36,8 @@ abstract class num implements Comparable<num> {
    * 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.