Fix backpropagation steps order in basics/quickstart_tutorial.py

[akshayavb99]

Fixes #3904

Description

The backpropagation steps are reordered to follow the correct order in basics/quickstart_tutorial.py

The reordered set of steps are as follows:

        # Zero the gradients for batch
        optimizer.zero_grad()
        # Compute prediction error
        pred = model(X)
        loss = loss_fn(pred, y)
        # Backpropagation
        loss.backward()
        # Optimizer step
        optimizer.step()

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3909

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