update param name of log_rmse() in kaggle-house-price.md
update param name of log_rmse() in kaggle-house-price.md

log_rmse()是一个泛用的损失函数，其定义不应该只接受train_features，而且事实上在后面`def train()`函数里也调用了`log_rmse(net, test_features, test_labels)`
mli/gluon-tutorials-zh,d2l-ai/d2l-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,d2l-ai/d2l-zh,d2l-ai/d2l-zh