Reconsider composition terminology

[seanpearsonuk]

We use composition terminology in the YAML file(s). We also reiterate the same wording in the doc. It seems that there should be a more suitable word.

[seanpearsonuk]

Deliberately left unassigned in the first instance.

Link: https://github.com/ansys/pyansys-units/pull/172/files#r1413864997

[hpohekar]

@seanpearsonuk

I think we can replace composition with combination.

https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/03%3A_Measurements/3.10%3A_Derived_Units

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https://www.studysmarter.co.uk/explanations/physics/physical-quantities-and-units/units-physics/#:~:text=multiple%20choice%20flashcards-,Units%20are%20used%20to%20measure%20a%20physical%20quantity%2C%20such%20as,unit%20being%20kilograms%20or%20pounds.

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[seanpearsonuk]

https://github.com/ansys/pyansys-units/pull/172/files#r1413676601

We would need to address those comments.