RFR: 8286773: cleanup @returns in sun.security classes

[Xue-Lei Andrew Fan]

On Sat, 14 May 2022 13:41:38 GMT, John Jiang <jjiang at openjdk.org> wrote:

> The below sun.security classes should use `@return` rather than `@returns`.
> sun/security/tools/keytool/Main.java
> sun/security/util/DerValue.java

Looks good to me.

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Marked as reviewed by xuelei (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/8714