Fix typo in 3D ResNet (#302)

* Fix typo in 3D ResNet

* Update facebookresearch_pytorchvideo_resnet.md

Author: cpprhtn

facebookresearch_pytorchvideo_resnet.md

@@ -160,11 +160,12 @@ print("Top 5 predicted labels: %s" % ", ".join(pred_class_names))
 ### Model Description
 The model architecture is based on [1] with pretrained weights using the 8x8 setting
 on the Kinetics dataset. 
+
 | arch | depth | frame length x sample rate | top 1 | top 5 | Flops (G) | Params (M) |
-| --------------- | ----------- | ----------- | ----------- | ----------- | ----------- |  ----------- | ----------- |
+| --------------- | ----------- | ----------- | ----------- | ----------- | ----------- |  ----------- |
 | Slow     | R50   | 8x8                        | 74.58 | 91.63 | 54.52     | 32.45     |
 
 
 ### References
 [1] Christoph Feichtenhofer et al, "SlowFast Networks for Video Recognition"
-https://arxiv.org/pdf/1812.03982.pdf
+https://arxiv.org/pdf/1812.03982.pdf