Backport of docs: add sysbatch
to scheduling internals into release/1.2.x
#12989
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Backport
This PR is auto-generated from #12954 to be assessed for backporting due to the inclusion of the label backport/1.2.x.
The below text is copied from the body of the original PR.
We could definitely write more about it here, but I just wanted to get the smallest possible correction out first.