Add import os to example code block

[FORTFANOP]

Fixes #3288

Description

Added import os to the documentation since it was missing

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 @wconstab @osalpekar @H-Huang @kwen2501

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3378

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As of commit caa13be with merge base 0f312df ():
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