fixed branch in IR tutorial
wrong branch. I applied this fix to rc This pull request **introduces 10 alerts** and **fixes 3** when merging 398409b424148af7b95a84fce097d7f053b6bca7 into 6594dd6dcd268cc7eeb1caf08a7b9ed18cd40556 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-13346d8c5f9ee999c6b43b23568223cccbc61a20)

**new alerts:**

* 6 for Unused import
* 2 for Modification of dictionary returned by locals\(\)
* 1 for Signature mismatch in overriding method
* 1 for Mismatch in multiple assignment

**fixed alerts:**

* 2 for Unused import
* 1 for Explicit export is not defined
Signed-off-by: AlexGrinch <grinchuk.alexey@gmail.com>