Add documentation for the `%run_viz` line magic changes

[SajidAlamQB]

Description

Following https://github.com/kedro-org/kedro-viz/pull/1733 we need to add documentation for the new changes to %run_viz line magic.

Checklist

• [x] Read the contributing guidelines
• [ ] Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• [x] Updated the documentation to reflect the code changes
• [ ] Added new entries to the RELEASE.md file
• [ ] Added tests to cover my changes