These *roff control lines were ill-formed. `.fi` is a request to turn
on filling, not a closing bracket for an `if` request (*roff is not a
Bourne shell).
https://www.gnu.org/software/groff/manual/groff.html.node/Conditional-Blocks.html
Further, *roff generally does not accept more than one request per
input line. Exceptions to this rule are the control structuring
requests (`if`, `ie`, `el`, and in GNU troff, `while`, `do` and `nop`).
But here, only one (`do`-nested) request is governed by the `if` anyway.
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