Update Modular_Arithmetic.ipynb

[callezenwaka]

Fix a typographic error

Description

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[SebastiaAgramunt]

Thanks for the nit @callezenwaka . Could you add me as reviewer so that I can review?

[callezenwaka]

Hi @SebastiaAgramunt,
I'm not sure that I have the right access to add reviewers.

[souravcipher]

I think @iamtrask or @yemikifouly can help here!