Minor style bug: remove backticks in the section of code

[Satyamkhadka]

On this page => https://pytorch.org/tutorials/beginner/introyt/introyt1_tutorial.html
in Datasets and Dataloaders section,

[Expected Result]

from torch.utils.data 
import ConcatDataset 
transform = transforms.Compose([transforms.ToTensor()]) 
trainset = torchvision.datasets.CIFAR10(root=’./data’, train=True,download=True, transform=transform)

#stack all train images together into a tensor of shape 
#(50000, 3, 32, 32) 
x = torch.stack([sample[0] for sample in ConcatDataset([trainset])])

#get the mean of each channel 
mean = torch.mean(x, dim=(0,2,3)) #tensor([0.4914, 0.4822, 0.4465]) 
std = torch.std(x, dim=(0,2,3)) #tensor([0.2470, 0.2435, 0.2616])

[ACTUAL RESULT]
```
from torch.utils.data
import ConcatDataset
transform = transforms.Compose([transforms.ToTensor()])
trainset = torchvision.datasets.CIFAR10(root=’./data’, train=True,download=True, transform=transform)

#stack all train images together into a tensor of shape
#(50000, 3, 32, 32)
x = torch.stack([sample[0] for sample in ConcatDataset([trainset])])

#get the mean of each channel
mean = torch.mean(x, dim=(0,2,3)) #tensor([0.4914, 0.4822, 0.4465])
std = torch.std(x, dim=(0,2,3)) #tensor([0.2470, 0.2435, 0.2616])
```

cc @svekars @sekyondaMeta @AlannaBurke

[Rachel0619]

/assigntome