docs: expand environment dev-mode description (#1583) #6

Job	Run time
Downstream builds with Python 3.8	40s
Downstream builds with Python 3.9	43s
Python 3.8 on Linux	1m 50s
Downstream builds with Python 3.10	37s
Python 3.9 on Linux	2m 3s
Downstream builds with Python 3.11	33s
Python 3.10 on Linux	2m 4s
Downstream builds with Python 3.12	50s
Python 3.11 on Linux	1m 52s
Python 3.12 on Linux	2m 19s
Python 3.8 on Windows	3m 45s
Python 3.9 on Windows	4m 32s
Python 3.10 on Windows	4m 14s
Python 3.11 on Windows	4m 20s
Python 3.12 on Windows	4m 25s
Python 3.8 on macOS	1m 35s
Python 3.9 on macOS	1m 6s
Python 3.10 on macOS	1m 9s
Python 3.11 on macOS	1m 9s
Python 3.12 on macOS	1m 15s
Report coverage	42s
check	4s
	41m 47s

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