v4.2.0-preview5
[SPARK-49174][BUILD][DOCS] Exclude the dir `docs/util` from `_site`
[SPARK-56630][INFRA] Surface javadoc crash culprit in unidoc failure output
[MINOR][DOCS] Add license header at docs/_plugins
[MINOR] Fix some typos
[MINOR][DOCS] Remove unneeded production tag block method