Fix/harmonize notebook render suggestion

[VPK570]

What is this PR:

• ✅ Bug fix

Why is this PR needed?
The suggestion printed by render.py when using the k3d backend
was inconsistent with the example in notebook_workflow.ipynb.
Users following the notebook would see conflicting instructions.

What does this PR do?
Updates the printed suggestion in render.py to use the Plotter()
approach, matching the notebook_workflow.ipynb example as confirmed
by @IgorTatarnikov in #442.

References:
Fixes #442

How has this PR been tested?
Verified the updated text in render.py matches the Plotter()
approach used in examples/notebook_workflow.ipynb. This is a
text-only change to the printed suggestion with no logic changes.

Is this a breaking change?
No. Only changes the text printed to the user, no functional changes.

Does this PR require an update to the documentation?
No. This aligns existing documentation/examples, no new docs needed.

Checklist:

• ✅ The code has been tested locally
• ✅ The code has been formatted with pre-commit