chore: Update environment variable seperator comment to indicate double underscore #771

Job	Run time
changes	6s
test-rust-project (lib)	1m 2s
test-rust-project (bin)	58s
test-benchmark (rust, lib)	1m 45s
test-benchmark (rust, bin)	1m 50s
test-benchmark (rust+wasm, lib)	1m 40s
test-benchmark (rust+wasm, bin)	1m 38s
run-pre-commit (rust, lib)	10m 34s
run-pre-commit (rust, bin)	8m 55s
run-pre-commit (rust+wasm, lib)	9m 26s
run-pre-commit (rust+wasm, bin)	9m 7s
test-rust-wasm-project (lib)	1m 17s
test-rust-wasm-project (bin)	1m 22s
run-pre-commit-axum (rust)	14m 54s
run-pre-commit-axum (rust+wasm)	14m 48s
test-benchmark-axum (rust)	9m 57s
test-benchmark-axum (rust+wasm)	9m 9s
nix-flake-check	0s
run-examples	0s
test-rust-axum-project	6m 37s
test-docker-axum	0s
test-docker	0s
test-rust-wasm-axum-project	7m 10s
	1h 52m 15s

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