PS-9810 Document new featuers in percona-202401 to percona-202404 tag… (#511)

* PS-9810 Document new featuers in percona-202401 to percona-202404 tags - 8.4.5-5

	modified:   docs/myrocks-server-variables.md

* Update myrocks-server-variables.md

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Co-authored-by: Alina Derkach <[email protected]>

Author: patrickbirch