Merge pull request #2524 from glureau/patch-1

typo

samples/src/main/java/com/example/retrofit/ErrorHandlingAdapter.java

@@ -180,7 +180,7 @@ public final class ErrorHandlingAdapter {
       }
 
       @Override public void networkError(IOException e) {
-        System.err.println("NETOWRK ERROR " + e.getMessage());
+        System.err.println("NETWORK ERROR " + e.getMessage());
       }
 
       @Override public void unexpectedError(Throwable t) {