Apply suggestions from code review

Co-authored-by: str4d <jack@electriccoin.co>

src/plonk.rs

@@ -92,7 +92,7 @@ impl<C: CurveAffine> VerifyingKey<C> {
 
         // Hash in final Blake2bState
         transcript.common_scalar(C::Scalar::from_bytes_wide(
-            hasher.finalize().as_bytes().try_into().unwrap(),
+            hasher.finalize().as_array(),
         ))?;
 
         Ok(())
@@ -103,7 +103,7 @@ impl<C: CurveAffine> std::fmt::Display for VerifyingKey<C> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
-            "VerificationKey {{\
+            "VerificationKey {{ \
             base_modulus = {base_modulus}, \
             scalar_modulus = {scalar_modulus}, \
             domain = {domain}, \

src/plonk/circuit.rs

@@ -384,7 +384,7 @@ impl<F: PrimeField> std::fmt::Display for ConstraintSystem<F> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
-            "ConstraintSystem {{\
+            "ConstraintSystem {{ \
              num_fixed_columns: {num_fixed_columns}, \
              num_advice_columns: {num_advice_columns}, \
              num_instance_columns: {num_instance_columns}, \

src/poly/domain.rs

@@ -381,7 +381,7 @@ impl<G: Group> std::fmt::Display for EvaluationDomain<G> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
         write!(
             f,
-            "Domain {{\
+            "Domain {{ \
             k = {k:?}, \
             extended_k = {extended_k:?}, \
             omega = {omega:?} \