Update note for legacy license path

What does this MR do and why?

The path to add legacy changes is different from 15.x. The current note implies if for any version higher than 14.1. This MR improves on this note

Screenshots or screen recordings

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.