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

[Aleksey Shipilev]

Clean backport to clearly document zapping values.

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Commit messages:
 - Backport c5a271259d9761aaae9298e9f29ebd93d734fb0e

Changes: https://git.openjdk.java.net/jdk17u/pull/63/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=63&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272850
  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/63.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/63/head:pull/63

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