Add ParameterDescriptor to 'Using parameters in a class (C++)' (backport #2865)

[mergify]

This is an automatic backport of pull request #2865 done by Mergify.
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Changes to be committed:
	modified:   source/Tutorials/Beginner-Client-Libraries/Using-Parameters-In-A-Class-Python.rst

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	both modified:   source/Tutorials/Beginner-Client-Libraries/Using-Parameters-In-A-Class-CPP.rst

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