Documentation update for Random class
Documentation update for Random class

Examples added

Closes https://github.com/dart-lang/sdk/pull/47986
https://github.com/dart-lang/sdk/pull/47986

GitOrigin-RevId: ecb3a428e3974d0505e8846626bd897359612117
Change-Id: I3c3a406482be6cb55bb01aba4f78c74ae2d7648f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/225120
Reviewed-by: Lasse Nielsen <80295e4ef244a07779f93eaa95d582bad8e316a5@google.com>
Commit-Queue: Lasse Nielsen <80295e4ef244a07779f93eaa95d582bad8e316a5@google.com>

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