Fix typo in HystrixCommand.java

Author: kmkr

hystrix-core/src/main/java/com/netflix/hystrix/HystrixCommand.java

@@ -209,7 +209,7 @@ public static Setter withGroupKey(HystrixCommandGroupKey groupKey) {
          *            <p>
          *            NOTE: Every unique {@link HystrixCommandKey} will result in new instances of {@link HystrixCircuitBreaker}, {@link HystrixCommandMetrics} and {@link HystrixCommandProperties}.
          *            Thus,
-         *            the number of variants should be kept to a finite and reasonable number to avoid high-memory usage or memory leacks.
+         *            the number of variants should be kept to a finite and reasonable number to avoid high-memory usage or memory leaks.
          *            <p>
          *            Hundreds of keys is fine, tens of thousands is probably not.
          * @return Setter for fluent interface via method chaining