doc: specify that xelatex is used as Latex engine
authorHeinrich Schuchardt <xypron.glpk@gmx.de>
Tue, 21 Apr 2020 10:11:58 +0000 (12:11 +0200)
committerTom Rini <trini@konsulko.com>
Mon, 27 Apr 2020 18:55:29 +0000 (14:55 -0400)
Building the pdf documentation on readthedocs.org fails with pdflatex.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

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