RFR: 8295857: Clarify that cleanup code can be skipped when the JVM terminates (e.g. when calling halt()) [v4]

[Brent Christian]

> [JDK-8290036](https://bugs.openjdk.org/browse/JDK-8290036) documented the shutdown sequence, noting that calling Runtime.halt() skips the shutdown sequence and immediately terminates the VM. Thus, "threads' current methods do not complete normally or abruptly; no finally clause of any method is executed".
> 
> One ramification of this is that resources within try-with-resource blocks will not be released. It would be good to state this explicitly.

Brent Christian has updated the pull request incrementally with one additional commit since the last revision:

  Update Runtime class doc re: other unexpected behaviors

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11218/files
  - new: https://git.openjdk.org/jdk/pull/11218/files/cbba781f..6df8acf8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11218&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11218&range=02-03

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11218.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11218/head:pull/11218

PR: https://git.openjdk.org/jdk/pull/11218