doc: Fix quote characters

LaTeX used to convert `'` quotes to a `’` even in verbatim environments.
This is unsuitable to copy commands from the documentation to the Linux
command line interface.

Since this use case is very important to use the documentation this has
to be fixed. Using the `upquote` package is sufficient to prevent the
conversion.

1 files changed, 1 insertions, 0 deletions

diff --git a/doc/documentation.tex b/doc/documentation.tex
index 885b215..b2f912b 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -8,6 +8,7 @@
 \usepackage{array}
 \usepackage{hyperref}
 \usepackage{parskip}
+\usepackage{upquote}
 
 \begin{document}