Small typo in DQN tutorial

[L0Z1K]

Description

I realized that the link for Gymnasium cannot be accessed because of typo.
Now, you can access the gymnasium website by hyperlink!

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.

cc @svekars @carljparker

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2694

• 📄 Preview Python docs built from this PR

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✅ No Failures

As of commit aca4b87 with merge base 5c632a0 ():
💚 Looks good so far! There are no failures yet. 💚

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[svekars]

Thanks! Can you please sign the CLA?

[L0Z1K]

@svekars Did it! :)

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