git: openjdk/jdk-sandbox: classfile-api-dev-branch: Classfile API javadoc build fix

[Adam Sotona]

Changeset: 0589dbee
Author:    Adam Sotona <asotona at openjdk.org>
Date:      2022-06-27 14:19:20 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/0589dbee5331beb8b9b20513313370a6086fc895

Classfile API javadoc build fix

! make/Docs.gmk