docs: Fix docs around what environment variable and commands to gener… #7029

Job	Run time
build-devbox (macos-13)	1m 7s
golangci-lint (macos-13)	6m 16s
golangci-lint (ubuntu-latest)	2m 12s
build-devbox (ubuntu-latest)	20s
Spell Check with Typos	0s
Test Flake Build	0s
auto-nix-install (ubuntu-latest, true)	1m 38s
test (is-main, ubuntu-latest, project-tests-only, 2.19.2)	10m 45s
test (is-main, ubuntu-latest, project-tests-off, 2.20.1)	9m 44s
test (is-main, ubuntu-latest, project-tests-off, 2.12.0)	11m 39s
auto-nix-install (macos-13, true)	4m 25s
auto-nix-install (macos-13, false)	4m 47s
test (is-main, ubuntu-latest, project-tests-only, 2.12.0)	10m 23s
auto-nix-install (ubuntu-latest, false)	1m 43s
test (is-main, ubuntu-latest, project-tests-only, 2.20.1)	10m 17s
test (is-main, ubuntu-latest, project-tests-off, 2.19.2)	9m 58s
test-nix-versions (ubuntu-latest, 2.16.1)	2m 1s
test-nix-versions (ubuntu-latest, 2.15.1)	2m 3s
test-nix-versions (ubuntu-latest, 2.18.0)	1m 37s
test-nix-versions (ubuntu-latest, 2.19.2)	1m 36s
test-nix-versions (ubuntu-latest, 2.24.7)	1m 27s
test-nix-versions (ubuntu-latest, 2.17.0)	1m 34s
test-nix-versions (macos-13, 2.16.1)	5m 49s
test-nix-versions (macos-13, 2.15.1)	4m 44s
test-nix-versions (macos-13, 2.18.0)	4m 32s
test-nix-versions (macos-13, 2.19.2)	4m 50s
test-nix-versions (macos-13, 2.24.7)	3m 49s
test-nix-versions (macos-13, 2.17.0)	4m 2s
	2h 3m 18s

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