Update contributing guide (#1196) #690

Job	Run time
Check types using pyright	34s
Build docs & run doctests	35s
Verify dev env (ubuntu-latest)	16s
Tests & Mypy on 3.7	1m 6s
Verify dev env (windows-latest)	55s
Tests & Mypy on 3.8	1m 30s
Tests & Mypy on 3.9	1m 20s
Tests & Mypy on 3.10	1m 41s
Tests & Mypy on 3.11	1m 48s
Tests & Mypy on 3.12	1m 42s
Tests & Mypy on pypy-3.8	1m 1s
Tests & Mypy on pypy-3.9	1m 7s
Tests & Mypy on pypy-3.10	2m 57s
Combine & check coverage.	18s
required-checks-pass	2s
	16m 52s

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