Update cheatsheet.fr.md

12.temporary_ins/80.energie-transformations-applications-impacts/20.n2/50.energy-mix/40.TD-hydroelectricity/50.parallel-1/cheatsheet.fr.md

@@ -96,7 +96,7 @@ $`=10^3\times\dfrac{6\times 3 \times 1 \times 10^{3+3+2}}{2}\times 10^1 \times 1
 
 $`= (13,5\times 10^{14}\,J)\times \left(\dfrac{1}{3,6\times 10^6}\,kWh.J^{-1}\right)`$   
 
-**$= 3,75 \times 10^8 \,kWh = 375 \,GWh}`$**
+**$\mathbf{= 3,75 \times 10^8 \,kWh = 375 \,GWh}`$**
 
 <!--**$`\mathbf{E_{\,stock}^{\,grav}= 3,75 \times 10^8 \,kWh = 375 \,GWh}`$**-->