Fix typo "handles" to "handled" in pinmem_nonblock.py

[champion254]

Description

This PR fixes a small grammatical typo in pinmem_nonblock.py.

• Original: "...cuda streams can be handles using"
• Fixed: "...cuda streams can be handled using"

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER") (N/A - Typo fix)
• 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

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