docs(syntax): add the duration division operator + fix the catala_en syntax highlighting

doc/syntax/Makefile

@@ -1,4 +1,7 @@
 syntax.pdf: syntax.tex
 	latexmk -pdf -halt-on-error -shell-escape -pvc syntax.tex
 
-.PRECIOUS .SECONDARY: syntax.pdf
+clean:
+	latexmk -C syntax.tex
+
+.PRECIOUS .SECONDARY: syntax.pdf

doc/syntax/syntax.tex

@@ -24,10 +24,6 @@ v.0.2.0
 
 \begin{multicols*}{2}
 
-
-
-
-
 \section*{Literate programming}
 \begin{center}
 \begin{tabular}{p{0.15\columnwidth}p{0.275\columnwidth}p{0.275\columnwidth}}
@@ -1465,6 +1461,23 @@ Duration substraction&
 \end{minted}
 \vspace*{-1.75em}
 \\
+Duration division&
+\vspace*{-1.75em}
+\begin{minted}{catala_en}
+```catala
+(duration) /^ (duration)
+```
+\end{minted}
+\vspace*{-1.75em}
+&
+\vspace*{-1.75em}
+\begin{minted}{catala_fr}
+```catala
+(durée) /^ (durée)
+```
+\end{minted}
+\vspace*{-1.75em}
+\\
 Duration comparison&
 \vspace*{-1.75em}
 \begin{minted}{catala_en}
@@ -1489,4 +1502,4 @@ Duration comparison&
 
 
 \end{multicols*}
-\end{document}
+\end{document}