fixup! 8595399791d14034dd85aa5a80d11693f9181693 improve intro
fixup! 8595399791d14034dd85aa5a80d11693f9181693 mention censor rules early
fixup! 8595399791d14034dd85aa5a80d11693f9181693 fix typos
fixup! 8595399791d14034dd85aa5a80d11693f9181693 clarify attachment redaction
fixup! 8595399791d14034dd85aa5a80d11693f9181693 clarify unstructured redaction
fixup! 8595399791d14034dd85aa5a80d11693f9181693 clarify unstructured redaction warning