Fix resource description of VerifyingIndexOutput.

Author: jpountz

src/main/java/org/elasticsearch/index/store/VerifyingIndexOutput.java

@@ -33,7 +33,7 @@ public abstract class VerifyingIndexOutput extends IndexOutput {
 
     /** Sole constructor */
     VerifyingIndexOutput(IndexOutput out) {
-        super("VerifyingIndexOutput(in=" + out + ")");
+        super("VerifyingIndexOutput(out=" + out + ")");
         this.out = out;
     }