chore(pkg): fix some function names in comment

Signed-off-by: binchengqu <[email protected]>

pkg/settlement/swap/chequebook/chequebook.go

@@ -61,7 +61,7 @@ type Service interface {
 	Issue(ctx context.Context, beneficiary common.Address, amount *big.Int, sendChequeFunc SendChequeFunc) (*big.Int, error)
 	// LastCheque returns the last cheque we issued for the beneficiary.
 	LastCheque(beneficiary common.Address) (*SignedCheque, error)
-	// LastCheque returns the last cheques for all beneficiaries.
+	// LastCheques returns the last cheques for all beneficiaries.
 	LastCheques() (map[common.Address]*SignedCheque, error)
 }
 
@@ -284,7 +284,7 @@ func keyBeneficiary(key []byte, prefix string) (beneficiary common.Address, err
 	return common.HexToAddress(split[1]), nil
 }
 
-// LastCheque returns the last cheques for all beneficiaries.
+// LastCheques returns the last cheques for all beneficiaries.
 func (s *service) LastCheques() (map[common.Address]*SignedCheque, error) {
 	result := make(map[common.Address]*SignedCheque)
 	err := s.store.Iterate(lastIssuedChequeKeyPrefix, func(key, val []byte) (stop bool, err error) {