crypto/bn256: add documentation on subgroup checks for G2 #32066
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This PR improves the IsOnCurve method for BN254 G2 points by:
Clarifying its behavior in the docstring, making it explicit that it verifies both the point being on the curve and in the correct subgroup.
Adding an in-line comment explaining the subgroup membership check (c.Mul(Order)).
Minor wording adjustments for readability and consistency.