Minor correction to the Anumal magic instructions markdown file

[Kristianwhittick]

This PR is to clarify the range can also equal zero.

Change the text from

Implement a GenerateWandEnergy function. The wand energy should be a random floating point number between 0.0 and 12.0.

Change the text to

Implement a GenerateWandEnergy function. The wand energy should be a random floating point number equal or greater than 0.0 and less than 12.0.

[github-actions]

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[andrerfcsantos]

Thanks for this!