Call a TextureAtlasLayout a layout and not an atlas #36355

Job	Run time
miri	7m 28s
ci	3m 10s
build (windows-latest)	5m 45s
toml	4s
build (ubuntu-latest)	3m 2s
check-bevy-internal-imports	7s
build (macos-latest)	8m 13s
check-missing-examples-in-docs	34s
check-doc	7m 24s
run-examples-on-windows-dx12	15m 56s
check-missing-features-in-docs	36s
markdownlint	1m 9s
check-compiles	3m 46s
build-wasm	1m 12s
msrv	1m 0s
	59m 26s

Provide feedback