[issue37759] Polish whatsnew for 3.8

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:


New changeset 4f9ffc9d1a6a293563deaaaaf4a13331302219b4 by Raymond Hettinger in branch 'master':
bpo-37759:  First round of major edits to Whatsnew 3.8 (GH-15127)
https://github.com/python/cpython/commit/4f9ffc9d1a6a293563deaaaaf4a13331302219b4


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