Documentation in impl PartialEq for $projective seems incorrect

[PlasmaPower]

A comment in the impl says:

pairing/src/bls12_381/ec.rs

Lines 55 to 57 in 183a64b

	// The points (X, Y, Z) and (X', Y', Z')
	// are equal when (X * Z^2) = (X' * Z'^2)
	// and (Y * Z^3) = (Y' * Z'^3).

However, the impl seems to actually check this:

                // The points (X, Y, Z) and (X', Y', Z')
                // are equal when (X * Z'^2) = (X' * Z^2)
                // and (Y * Z'^3) = (Y' * Z^3).

I think the comment is wrong and the implementation is correct. Either way, this should be fixed.

[burdges]

#93 fixes this