Fix typos in STL docs

[martinschonger]

No description provided.

[martinschonger]

@microsoft-github-policy-service agree

[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit f11d9dd:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/standard-library/algorithms.md	✅Succeeded
docs/standard-library/functional.md	✅Succeeded
docs/standard-library/stl-containers.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[Court72]

Thanks for the typo fixes!