[DOCS] Terminal Output Review for Session View

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For the 8.5 Release, we will release Terminal Output Review for Session View
https://github.com/elastic/security-team/issues/2644
[after reading the ticket]

Description

This new feature will allow security analysts to view the terminal output in the session viewer to understand a compromised session better.
The ticket mentioned above has screenshots and video recordings of how navigation works and the information displayed.

What's needed

• Outline the business benefit from infosec analyst
• Outline how to enable output within settings; current Terminal Output has a default = off
• Outlined the workflow between session view jumping in and out of the terminal view
• Outline the controls within the terminal view
• Outline the index where to expect terminal output data streams

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cc.ing Working Group: @nick-alayil @m-sample @mitodrummer @zizhouW @opauloh @lrishi @mattnite @mmat11 @norrietaylor