Fix typos and improve explanation in "Show traffic on the map" article (Azure Maps)

[scrooge1987]

• Slightly improved explanation of the "Add Traffic Controls" section
• Fixed two typos in a JavaScript example for the "Add Traffic Controls" section

[prmerger-automator]

@scrooge1987 : 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 db77eb5:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/azure-maps/map-show-traffic.md	✅Succeeded

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[learn-build-service-prod]

Learn Build status updates of commit 2965898:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/azure-maps/map-show-traffic.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

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PRMerger Results

Issue	Description
CodePen	PR contains one or more CodePen iframe, which must be human reviewed to ensure requirements are met.

[Court72]

@sinnypan

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

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