bpo-33656: Add entry to What's New 3.7. (GH-7638)

bpo-33656: Add entry to What's New 3.7. (GH-7638) · python/cpython@8a05f55

Original file line number	Diff line number	Diff line change
`@@ -991,6 +991,12 @@ colors for custom themes is added to Highlights tab of Settings dialog.`
`991`	`991`	(Contributed by Cheryl Sabella and Terry Jan Reedy in :issue:`33642`,
`992`	`992`	:issue:`33768`, and :issue:`33679`,
`993`	`993`
	`994`	`+On Windows, a new API call tells Windows that tk scales for DPI. On Windows`
	`995`	`+8.1+ or 10, with DPI compatibility properties of the Python binary`
	`996`	`+unchanged, and a monitor resolution greater than 96 DPI, this should`
	`997`	`+make text and lines sharper. It should otherwise have no effect.`
	`998`	+(Contributed by Terry Jan Reedy in :issue:`33656`).
	`999`	`+`
`994`	`1000`	`The changes above have been backported to 3.6 maintenance releases.`
`995`	`1001`
`996`	`1002`