[v4.x backport] doc: add documentation for killed
property of ChildProcess instance
#14635
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Backport of #14578. (It adds links to preserve old names of links in the 6.x docs. Unneeded in 9.x and forward because those links never existed in those docs.
Checklist
make -j4 test
(UNIX), orvcbuild test
(Windows) passesAffected core subsystem(s)