fix description of equation in polynomial_autograd.py example

[telamonian]

Description

In the polynomial_autograd.py example, the equation that a + bx + cx^2 + d*x^3 converges to changed in a recent commit, from y=sin(x) to y=e^x. However, they didn't change the text description of the equation. This commit fixes that.

Checklist

• Only one issue is addressed in 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/3897

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