DOC-5229 probabilistic data type examples (#3413)

* DOC-5078 added basic vector set examples

* DOC-5078 formatting and extra comments

* DOC-5078 fixed nondeterministic test

* wip(tests): run doctests for vector sets on redis 8 only

* DOC-5229 added probabilistic data type examples

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Co-authored-by: Nedyalko Dyakov <nedyalko.dyakov@gmail.com>

Author: andy-stark-redis