[Docs] Improve IntFw intro demo code

[Pythonic-Rainbow]

Description

I just started learning how to use the interaction framework, and I found the demo codea bit confusing because it only showed the InteractionService being created. Later on the doc mentioned that using this service is similar to the Text-based Command method, but didn't say what is/is not similar. I rewrote the code to include a short demo of how to actually activate the service.

Changes

Rewrote demo code for Interaction Framework introduction

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