SEI-14315 Update SEI Azure DevOps Integration Documentation

[alai97]

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Description

• Please describe your changes: Adds clarification for what happens when a personal access token with access is revoked/changed. Raised by Yash on Jira.
• Jira/GitHub Issue numbers (if any): https://harness.atlassian.net/browse/SEI-14315
• Preview links/images (Internal contributors only): __________________

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• Successful preview build.
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[bot-gitexp-user]

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[santoshdodamani]

LGTM

[bot-gitexp-user]

Please check the Execution Link of the Pipeline for the Website Draft URL. This is located in the Preview Step behind the Harness VPN and also is available in #hdh_alerts. E.g Website Draft URL: https://unique-id--harness-developer.netlify.app. Current Draft URL is: https://68d6e7c3e962830095af7bb7--harness-developer.netlify.app