RFR: 8262893: Enable more doclint checks in javadoc build

[Erik Joelsson]

On Tue, 2 Mar 2021 22:41:38 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> With recent cleanups, several doclint categories have been cleared across the JDK and should be enabled in the javadoc build to make sure they stay clean.
> 
> Local docs build completes with this stricter set of checks.

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2799