Improve clarity on outdated BeLL system reference in Step 4 videos

[uj-sxn]

Please verify the following:

• This issue is related to the Virtual Interns First Steps document or Planet User Manual.
• You have searched for relevant keywords in recent open and closed issues to avoid duplicates.

URL to the MDwiki page containing the problem

https://open-learning-exchange.github.io/#!./pages/vi/vi-planetapps.md

Problem

Location of Problem:
The "Watch Videos" section in Step 4.1 - Planet Tutorial.

Problem Details :
The introductory sentence for the recommended videos uses awkward and slightly defensive phrasing when referring to the older system:

"While they were created some years ago using the old BeLL system, they still provide a good introduction:"

This phrasing unnecessarily highlights the content's age and can cause a new intern to question the value of the required video content.

Screenshots (when necessary)

Proposed solution(s)

Proposed Solution (General Improvement):
Reword the introductory sentence to clearly and concisely explain why videos based on the BeLL system are still useful, focusing on the concepts that remain relevant to the Planet system.

Suggested Rewording:
"These videos were created using the older BeLL system, but the core functionality and interface concepts remain similar to Planet and provide a good introduction to the following topics:"