Explain how RegularPolygon mesh is generated #33400

Job	Run time
miri	5m 48s
build (windows-latest)	6m 41s
ci	2m 55s
build (ubuntu-latest)	2m 5s
build (macos-latest)	6m 2s
check-bevy-internal-imports	4s
check-doc	6m 29s
check-missing-examples-in-docs	29s
run-examples-on-windows-dx12	13m 29s
toml	7s
check-missing-features-in-docs	35s
markdownlint	1m 10s
check-compiles	2m 35s
msrv	58s
build-wasm	1m 5s
	50m 32s

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