Incorrect documentation for `check_point_order_equals_group_order`

[tjade273]

In the documentation for check_point_order_equals_group_order,

curv/src/elliptic/curves/traits.rs

Line 185 in 44537a7

/// P ≠ 0 ∧ qP ≠ 0

should presumably read

/// P ≠ 0 ∧ qP = 0

The implementation appears to be correct, so just a simple doc fix should suffice.

[tjade273]

In addition,

curv/src/elliptic/curves/bls12_381/g2.rs

Line 249 in 44537a7

/// Converts message to G1 point.

should say G2 instead of G1

[leontiadZen]

Thanks @tjade273 , feel free to open a PR :)