[docs] [issue40211] Clarify preadv and pwritev is supported AIX 7.1 and newer.

6 Apr 2020


      Change by Batuhan Taskaya :


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keywords: +patch
pull_requests: +18762
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/19401

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Python tracker 
https://bugs.python.org/issue40211
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