git: openjdk/jdk-sandbox: classfile-api-javadoc-branch: fixed old redirect

[Adam Sotona]

Changeset: 71f235d5
Author:    Adam Sotona <asotona at openjdk.org>
Date:      2023-02-06 11:13:39 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/71f235d5725ad08ff142418cb80a421aa103c6f7

fixed old redirect

! doc/classfile-api/javadoc/java.base/jdk/classfile/package-summary.html