miscellaneous improvements of wording

<<If>> $\mathbb{F}_q$ <<is>> a finite field with $q$ elements, then the general linear group $\operatorname{GL}(n, \mathbb{F}_q)$ over the field $\mathbb{F}_q$

1. is a finite group <<of order>> $\lvert \operatorname{GL}(n, \mathbb{F}_q) \rvert = \prod_{i=0}^{n-1}(q^n-q^i)$<<, and>>

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