docs: alternative operands in a print placeholder - #39
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Documents the print-placeholder fallback proposed in #51.
A placeholder may list several paths separated by
|and the first one resolving to a non-blank value is rendered. The section explains the failure it removes (an optional twin field - a locally registered name beside the canonical one - leaves a hole in a legal document for every record with the other one filled) and the normative rules, including the one that keeps it safe: the last operand is rendered whatever it holds, so a single path is the one-operand case and an existing template is byte-identical until it adopts the syntax.Added to
/spec/presentationunder Printable documents, plus a reference-index row.npx vitepress build docsclean. Left open pending the proposal.