Fix typo Update CONTRIBUTING.md

[Hack666r]

I corrected a typo in the CONTRIBUTING.md file by fixing the word "bellow" to "below" in the instructions.

Specific Change:
Before:
By following the steps bellow you will understand the development process and worflow.
After:
By following the steps below you will understand the development process and worflow.
This change improves the accuracy of the language in the guide, making the instructions clearer and more professional.

[github-actions]

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[dasanra]

Fixed in #1096