[Docs] Fixed typo in pytorch2torchscript.md (#1173)

* [Docs] Fixed typo in pytorch2torchscript.md

* [Docs] Fixed W293 blank line contains whitespace

docs/en/tools/pytorch2torchscript.md

@@ -35,7 +35,7 @@ python tools/deployment/pytorch2torchscript.py \
 Example:
 
 ```bash
-python tools/deployment/pytorch2onnx.py \
+python tools/deployment/pytorch2torchscript.py \
     configs/resnet/resnet18_8xb16_cifar10.py \
     --checkpoint checkpoints/resnet/resnet18_8xb16_cifar10.pth \
     --output-file checkpoints/resnet/resnet18_8xb16_cifar10.pt \

docs/zh_CN/tools/pytorch2torchscript.md

@@ -33,7 +33,7 @@ python tools/deployment/pytorch2torchscript.py \
 示例：
 
 ```bash
-python tools/deployment/pytorch2onnx.py \
+python tools/deployment/pytorch2torchscript.py \
     configs/resnet/resnet18_8xb16_cifar10.py \
     --checkpoint checkpoints/resnet/resnet18_b16x8_cifar10.pth \
     --output-file checkpoints/resnet/resnet18_b16x8_cifar10.pt \

mmcls/datasets/dataset_wrappers.py

@@ -179,7 +179,7 @@ class ClassBalancedDataset(object):
 
         .. math::
             r(c) = \max(1, \sqrt{\frac{t}{f(c)}})
-       
+
        where :math:`t` is `oversample_thr`.
     3. For each image I and its labels :math:`L(I)`, compute the image-level
        repeat factor.