[jdk17u] RFR: 8272850: Drop zapping values in the Zap* option descriptions

[Aleksey Shipilev]

On Fri, 10 Sep 2021 08:57:02 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to clearly document zapping values.

Got the push approval.

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PR: https://git.openjdk.java.net/jdk17u/pull/63