chore: Groom NEWS intro #2504

Job	Run time
Build source R package	5m 10s
Sanitizer	23m 51s
Coverage	4m 53s
Check windows-latest (release)	18m 10s
Check macOS-latest (release)	10m 26s
Check ubuntu-20.04 (release)	5m 52s
Check ubuntu-20.04 (devel)	6m 32s
Check ubuntu-20.04 (oldrel-1)	6m 25s
Check ubuntu-20.04 (oldrel-2)	5m 39s
Check ubuntu-20.04 (oldrel-3)	6m 8s
Check ubuntu-20.04 (oldrel-4)	5m 49s
	1h 38m 55s

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