fix typo in tracers/api.go

Constuct -> Construct

eth/tracers/api.go

@@ -802,7 +802,7 @@ func (api *API) traceTx(ctx context.Context, message core.Message, txctx *Contex
 				return nil, err
 			}
 		}
-		// Constuct the JavaScript tracer to execute with
+		// Construct the JavaScript tracer to execute with
 		if tracer, err = New(*config.Tracer, txctx); err != nil {
 			return nil, err
 		}