Fix and improve MSAA documentation (#16196) #2

Job	Run time
check-doc	11m 42s
check-bevy-internal-imports	4s
build (windows-latest)	11m 9s
build (ubuntu-latest)	4m 39s
check-missing-examples-in-docs	30s
ci	4m 47s
build (macos-latest)	4m 23s
miri	12m 57s
run-examples-macos-metal	5m 31s
toml	1m 59s
typos	6s
check-missing-features-in-docs	31s
markdownlint	1m 12s
check-compiles-no-std	1m 0s
check-compiles	7m 16s
build-wasm-atomics	1m 55s
build-wasm	1m 50s
msrv	1m 49s
	1h 13m 20s

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