[SPARK-3359] [DOCS] More changes to resolve javadoc 8 errors that will help unidoc/genjavadoc compatibility #14221
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What changes were proposed in this pull request?
These are yet more changes that resolve problems with unidoc/genjavadoc and Java 8. It does not fully resolve the problem, but gets rid of as many errors as we can from this end.
How was this patch tested?
Jenkins build of docs