Document None conditions on compute_aabb #33765

Job	Run time
ci	2m 5s
toml	4s
build (windows-latest)	4m 4s
build (ubuntu-latest)	2m 37s
check-doc	6m 12s
check-bevy-internal-imports	6s
build (macos-latest)	4m 20s
check-missing-examples-in-docs	30s
miri	7m 3s
run-examples-on-windows-dx12	13m 39s
check-missing-features-in-docs	27s
markdownlint	1m 17s
check-compiles	3m 4s
msrv	1m 1s
build-wasm	2m 34s
	49m 3s

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