Update interactive.py
Update interactive.py

Change visualization_help `visualization.html.` to `visualization.html .`,(add a space before the end dot.) Then So it can jump to this link (like: `http://localhost:5006/visualization.html` ) directly by Ctrl + click but not `http://localhost:5006/visualization.html.` Because the dot at the end is recognized as part of the URL when clicked.
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