docs: improve Edge connectivity docs #2519

Job	Run time
Build source R package	6m 14s
Coverage	5m 22s
Sanitizer	24m 11s
Check windows-latest (release)	18m 34s
Check macOS-latest (release)	17m 35s
Check ubuntu-20.04 (release)	6m 15s
Check ubuntu-20.04 (devel)	6m 39s
Check ubuntu-20.04 (oldrel-1)	6m 59s
Check ubuntu-20.04 (oldrel-2)	6m 5s
Check ubuntu-20.04 (oldrel-3)	6m 18s
Check ubuntu-20.04 (oldrel-4)	6m 32s
	1h 50m 44s

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