Update README.md

[owenzimmew06]

I suggest two corrections in this document:

First; "equal 2 or 3" sgould be "equals 2 or 3"

In "directly (i.e. m equal 2 or 3)," "equal" should be "equals" for proper grammar,

Second; "holding two base field elements" → "which holds two base field elements"

In "Struct representing a quadratic extension field, in this case holding two base field elements," restructuring improves clarity.

Thanks.

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closes: #XXXX

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[z-tech]

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