core: fix comment typo (ethereum#17236)

core/state_transition.go

@@ -35,7 +35,7 @@ var (
 The State Transitioning Model
 
 A state transition is a change made when a transaction is applied to the current world state
-The state transitioning model does all all the necessary work to work out a valid new state root.
+The state transitioning model does all the necessary work to work out a valid new state root.
 
 1) Nonce handling
 2) Pre pay gas
@@ -178,8 +178,8 @@ func (st *StateTransition) preCheck() error {
 }
 
 // TransitionDb will transition the state by applying the current message and
-// returning the result including the the used gas. It returns an error if it
-// failed. An error indicates a consensus issue.
+// returning the result including the used gas. It returns an error if failed.
+// An error indicates a consensus issue.
 func (st *StateTransition) TransitionDb() (ret []byte, usedGas uint64, failed bool, err error) {
 	if err = st.preCheck(); err != nil {
 		return