Improve documentation for random (#17015)
Improve documentation for random (#17015)

* Improve documentation for random

Use runnableExamples
Minor changes

* Apply suggestions

Remove echo
Use RNG in more places

* Fix skipRandomNumbers example
dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim