doc: clarify where delegated contract gets value

Author: ARR4N

core/vm/contracts.libevm.go

@@ -236,7 +236,7 @@ func (args *evmCallArgs) env() *environment {
 		self = args.addr
 
 	case DelegateCall:
-		value = nil // inherited from `args.caller`
+		value = nil // inherited from `args.caller` inside [Contract.AsDelegate]
 		fallthrough
 	case CallCode:
 		self = args.caller.Address()

core/vm/contracts.libevm_test.go

@@ -280,7 +280,7 @@ func TestNewStatefulPrecompile(t *testing.T) {
 				Raw: &rawAddresses,
 			},
 			wantReadOnly:  false,
-			wantCallValue: callCallerValue,
+			wantCallValue: callCallerValue, // Important difference from [vm.EVM.Call]
 			wantCallType:  vm.DelegateCall,
 		},
 		{