docs: Explain backwards compat in SDK use case #26

Job	Run time
Rego PR checks	1m 45s
Generate Code	1m 25s
YAML Lint	32s
Go Lint	2m 12s
Go Test (linux)	4m 52s
Go Build (linux amd64)	2m 25s
Go Test (darwin)	4m 44s
Go Build (linux arm64)	2m 6s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 16s
Go Build (windows amd64)	2m 50s
Check Generated	32s
Go Build (darwin amd64)	1m 43s
Go compat build/test (ubuntu-22.04, 1.21)	3m 11s
Go Race Detector	6m 22s
Go Build (darwin arm64)	36s
Go compat build/test (macos-14, 1.21)	4m 23s
WASM	9s
docker image smoke test	1m 0s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	18s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	12s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	31s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	15s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	1m 5s
	45m 24s

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