fix fast_rcnn tutorial comments

new_tutorials/train/segmentation/fast_scnn.py

@@ -35,7 +35,7 @@ eval_dataset = pdx.datasets.SegDataset(
 # 浏览器打开 https://0.0.0.0:8001即可
 # 其中0.0.0.0为本机访问，如为远程服务, 改成相应机器IP
 
-# https://paddlex.readthedocs.io/zh_CN/latest/apis/models/semantic_segmentation.html#hrnet
+# https://paddlex.readthedocs.io/zh_CN/latest/apis/models/semantic_segmentation.html#fastscnn
 num_classes = len(train_dataset.labels)
 model = pdx.seg.FastSCNN(num_classes=num_classes)
 model.train(