RFR: 8366157: Clarify in man pages that only G1 and Parallel supports MaxGCPauseMillis [v3]

[Jonas Norlinder]

> Hi all,
> 
> This patch clarifies the description of `MaxGCPauseMillis`.

Jonas Norlinder has updated the pull request incrementally with one additional commit since the last revision:

  Parallel do support a pause time target but does not use it by default

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/26940/files
  - new: https://git.openjdk.org/jdk/pull/26940/files/868d446f..d70a6d7a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26940&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26940&range=01-02

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26940.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26940/head:pull/26940

PR: https://git.openjdk.org/jdk/pull/26940