Fix typo in docs/standard-library/atomic-structure.md

[Alice2O3]

Fix typo of "atomic::operator|;=" to "atomic::operator|=" in docs/standard-library/atomic-structure.md

[prmerger-automator]

@Alice2O3 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

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[Court72]

@TylerMSFT

Can you review the proposed changes?

When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[TylerMSFT]

Thank you, @alice203! Appreciate you improving the docs.

[Alice2O3]

OK, thank you! Btw, my user name is acutally @Alice2O3 (O is actually capital "o", not zero), don't at the wrong person :)