Update documentation for time sensitive tests
What does this MR do and why?
Removes mentioning travel_back from documentation for time sensitive tests.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #403644 (closed)
Edited by Valery Sizov