Make `feature(doc_auto_cfg)` work #39205

Job	Run time
build (windows-latest)	4m 24s
check-doc	7m 31s
build (ubuntu-latest)	2m 6s
build (macos-latest)	4m 4s
check-missing-examples-in-docs	29s
ci	3m 33s
run-examples-macos-metal	4m 20s
miri	6m 11s
toml	2m 0s
typos	6s
check-bevy-internal-imports	3s
check-cfg	49s
check-missing-features-in-docs	30s
markdownlint	1m 22s
check-compiles	4m 19s
msrv	54s
build-wasm	43s
	43m 24s

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