Improve slicing example in RELEASES.md

Author: jturner314

RELEASES.md

@@ -7,7 +7,7 @@ New features
 - Support inserting new axes while slicing by [@jturner314]. This is an example:
 
   ```rust
-  let view = arr.slice(s![.., -1, NewAxis, ..;-1]);
+  let view = arr.slice(s![.., -1, 2..;-1, NewAxis]);
   ```
 
   https://github.com/rust-ndarray/ndarray/pull/570