Adds description for nut pouring task (#454)

# Description

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Adds a text description telling the users how to complete the nut
pouring task.


## Type of change

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- Documentation update

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [ ] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

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docs/source/overview/teleop_imitation.rst

@@ -529,6 +529,11 @@ generated using Isaac Lab Mimic for the ``Isaac-NutPour-GR1T2-Pink-IK-Abs-Mimic-
 .. hint::
 
    If desired, data collection, annotation, and generation can be done using the same commands as the prior examples.
+
+   The robot first picks up the red beaker and pours the contents into the yellow bowl.
+   Then, it drops the red beaker into the blue bin. Lastly, it places the yellow bowl onto the white scale.
+   See the video in the :ref:`visualize-results-demo-2` section below for a visual demonstration of the task.
+
    **Note that the following commands are only for your reference and are not required for this demo.**
 
    To collect demonstrations:
@@ -592,6 +597,8 @@ Record the normalization parameters for later use in the visualization step.
 .. note::
    By default the trained models and logs will be saved to ``IsaacLab/logs/robomimic``.
 
+.. _visualize-results-demo-2:
+
 Visualize the results
 ^^^^^^^^^^^^^^^^^^^^^