docs: Add arrays to composite values section #10194

Job	Run time
Generate Code	1m 13s
Rego PR checks	1m 32s
Go Lint	1m 34s
YAML Lint	20s
Check Generated	32s
Go Test (linux)	4m 41s
Go compat build/test (ubuntu-22.04, 1.20)	2m 43s
Go Test (darwin)	4m 19s
Go Build (linux amd64)	2m 34s
Go compat build/test (macos-14, 1.20)	4m 9s
Go Race Detector	6m 10s
Go Build (linux arm64)	2m 8s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 7s
WASM	8s
Go Build (windows amd64)	2m 31s
Go Build (darwin amd64)	1m 27s
Go Build (darwin arm64)	1m 2s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	11s
docker image smoke test	34s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	16s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	38s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	15s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	30s
	41m 34s

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