field: fix Invert comment #48
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[Curve25519: new Diffie-Hellman speed records](https://cr.yp.to/ecdh/curve25519-20060209.pdf) states that inverting an element is "a straightforward sequence of 254 squarings and 11 multiplications" which can also be verified by counting the number of [Element.Square] calls.
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Curve25519: new Diffie-Hellman speed records states that inverting an element is "a straightforward sequence of 254 squarings and 11 multiplications" which can also be verified by counting the number of [Element.Square] calls.