Mention in docs about the query iteration order and result uniqueness. #38351

Job	Run time
ci	1m 37s
miri	5m 59s
check-bevy-internal-imports	7s
build (windows-latest)	4m 4s
build (ubuntu-latest)	2m 1s
check-cfg	1m 33s
build (macos-latest)	2m 24s
check-doc	7m 36s
check-missing-examples-in-docs	29s
run-examples-macos-metal	4m 22s
toml	2m 0s
typos	6s
check-missing-features-in-docs	31s
markdownlint	1m 16s
check-compiles	2m 8s
build-wasm	37s
msrv	51s
	37m 41s

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