Applied comments from PR

fuel-tx/src/tests/offset.rs

@@ -1,3 +1,8 @@
+//! This module tests the offset calculation for each field of each transaction type in
+//! canonical representation. Since each transaction can be executed inside FuelVM
+//! it lives inside VM's memory. The predicate or script may want to have access to
+//! different fields of transactions. An offset is used to access it.
+
 use crate::{
     field::{
         InputContract,

fuel-tx/src/tests/valid_cases/transaction/upgrade.rs

@@ -613,7 +613,8 @@ fn check__errors_when_consensus_parameters_different_than_calculated_metadata()
     assert_eq!(Err(ValidityError::TransactionMetadataMismatch), result);
 }
 
-mod inputs {
+// The module tests that `Upgrade` transaction can work with different input types.
+mod check_inputs {
     use super::*;
     use itertools::Itertools;