Update cheatsheet.fr.md

12.temporary_ins/80.energie-transformations-applications-impacts/20.n2/50.energy-mix/40.TD-hydroelectricity/20.gravitational-energy-storage/20.overview/cheatsheet.fr.md

@@ -74,6 +74,8 @@ $`\def\PSclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
 
 *$`\hspace{1,6cm}\mathbf{=3,6\times 10^6\;J = 3,6 \;MJ}`$*
 
+<br>
+
 **$`\mathbf{\large{\mathcal{F}_{J\rightarrow kWh}}}`$** $`=\dfrac{1\,kWh}{3,6\times 10^6\,J}`$
 
 $`\hspace{1,6cm}=\dfrac{1}{3,6\times 10^6}\;kWh.J^{-1}`$