8354872: Clarify java.lang.Process resource cleanup

[RogerRiggs]

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.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
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• Commit message must refer to an issue
• Change requires CSR request JDK-8356311 to be approved

Issues

• JDK-8354872: Clarify java.lang.Process resource cleanup (Bug - P4)
• JDK-8356311: Clarify java.lang.Process resource cleanup (CSR)

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