Corrected the description of the Matrices Handler in matrics.py

[ghost]

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Brief description of what is fixed or changed -> The description was exactly copied from the calculus.py file(the calculus handler). I corrected it by adding the description of the matrices handler.

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#### Brief description of what is fixed or changed -> The description was exactly copied from the calculus.py file(the calculus handler).  I corrected it by adding the description of the matrices handler.


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[sidhu1012]

Probably space between comma would be better
Square, Symmetric, Invertible

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