[PowerShell Sample] Update Sessions index.md

[EwertonJordao]

add sample from pull request #536

[opbld31]

Docs Build status updates of commit 7d9586d:

:warning: Validation status: warnings

File	Status	Preview URL	Details
iis/configuration/system.applicationHost/sites/site/ftpServer/sessions/index.md	:warning:Warning	View	Details

iis/configuration/system.applicationHost/sites/site/ftpServer/sessions/index.md

• Line 176, Column 1: [Warning-codesnippet-not-found] Invalid code snippet link: 'index/samples/sample5.ps1'.
• Line 4, Column 14: [Suggestion-duplicate-descriptions] Attribute 'description' with value 'Overview The <sessions> element is a dynamically generated collection of <session> elements, each of which is dynamically created by the FTP serv...' is duplicated in 'configuration/system.applicationHost/sites/site/ftpServer/sessions/index.md(4,14)', 'configuration/system.applicationHost/sites/site/ftpServer/sessions/session.md(4,14)'.
• Line 50, Column 6: [Suggestion-alt-text-missing] Missing alternate text for image 'index/_static/image2.png'. Alt text is required for accessibility.
• Line 63, Column 6: [Suggestion-alt-text-missing] Missing alternate text for image 'index/_static/image4.png'. Alt text is required for accessibility.
• Line 77, Column 6: [Suggestion-alt-text-missing] Missing alternate text for image 'index/_static/image6.png'. Alt text is required for accessibility.
• Line 91, Column 6: [Suggestion-alt-text-missing] Missing alternate text for image 'index/_static/image8.png'. Alt text is required for accessibility.
• Line 125, Column 6: [Suggestion-alt-text-missing] Missing alternate text for image 'index/_static/image10.png'. Alt text is required for accessibility.
• Line 127, Column 6: [Suggestion-alt-text-missing] Missing alternate text for image 'index/_static/image12.png'. Alt text is required for accessibility.

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[Rick-Anderson]

@John-Hart needs to approve this.

[EwertonJordao]

@Rick-Anderson any chance to merge this PR?

Thank you.