Added mar troubleshooting section

[mikefrobbins]

PR Summary

Fixes AB#484819 - Added mar troubleshooting section

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

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✅ No issues found

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[learn-build-service-prod]

Learn Build status updates of commit 7265bf3:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-conceptual/azps-14.3.0/troubleshooting.md	✅Succeeded	View (azps-14.3.0)

For more details, please refer to the build report.