[jdk17u-dev] RFR: 8279505: Update documentation for RETRY_COUNT and REPEAT_COUNT

[Aleksey Shipilev]

Clean backport to improve docs.

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Commit messages:
 - Backport bc12381105ef5ba14f99304a220817e97c9a99b5

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/78/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=78&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279505
  Stats: 8 lines in 2 files changed: 4 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/78.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/78/head:pull/78

PR: https://git.openjdk.java.net/jdk17u-dev/pull/78