[Chapel Merge] Improve sys_getenv documentation

Branch: refs/heads/master
Revision: 95237d0
Author: bradcray
Log Message:

Merge pull request #16996 from Yudhishthira1406/getenv-doc

Improve sys_getenv documentation

[Implemented by @Yudhishthira1406, reviewed by me]

Solves Issue #16705

This PR adds documentation to the sys_getenv procedure in the Sys module.

Modified Files:
M modules/standard/Sys.chpl

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