Spell correction.

Author: Manish Maheshwari

hystrix-contrib/hystrix-javanica/README.md

@@ -107,7 +107,7 @@ The return type of command method should be Future that indicates that a command
 
 ## Reactive Execution
 
-To performe "Reactive Execution" you should return an instance of `Observable` in your command method as in the exapmple below:
+To performe "Reactive Execution" you should return an instance of `Observable` in your command method as in the example below:
 
 ```java
     @HystrixCommand