Fix typo in comment about activation functions

[elharo]

Description

simple grammar fix

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• [X ] Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• [X ] 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/3903

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As of commit 58d9a31 with merge base bcb7e29 ():

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  Process completed with exit code 1.

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[meta-cla]

Hi @elharo!

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[elharo]

FYI I am not going to sign a Meta CLA. It's time to transition these repos to EasyCLA and the Linux Foundation as has been done, for example, by the Presto Foundation, where anyone can contribute on equal footing without assigning special rights to a single corporation.

Feel free to close this PR and make the fix yourself if you like, but it is past time to make this a true open source project.