RFR: 8354872: Clarify java.lang.Process resource cleanup [v4]

[Roger Riggs]

> Improve the documentation of Process use of system resources.
> 
> Describe the implementation closing streams when no longer referenced.
> Clarify the interactions between inputStream and inputReader and errorStream and errorReader.
> Add advice and example using try-with-resources to open and close streams.
> Recommend closing streams when no longer in use.

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Fix links per review comments and snippet syntax in ProcessBuilder.Redirect.DISCARD.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25884/files
  - new: https://git.openjdk.org/jdk/pull/25884/files/868c93aa..eafd5611

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25884&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25884&range=02-03

  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25884.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25884/head:pull/25884

PR: https://git.openjdk.org/jdk/pull/25884