Update cheatsheet.fr.md

12.temporary_ins/10.electrostatics-vacuum/40.gauss-theorem-applications/25.cylindrical-charge-distributions/20.gauss-local/20.overview/cheatsheet.fr.md

@@ -420,7 +420,7 @@ donc à l'*intérieur du cylindre chargé* mais hors axe de révolution :
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 **$`\displaystyle\mathbf{\hspace{2.6cm}=\int \dfrac{\rho\,\dens_0^{3D}}{\epsilon_0}\,d\rho}`$**   
 <!---br>
-$`\displaystyle\hspace{2.6cm}=\dfrac{\dens_0^{3D}}{\epsilon_0}\int \rho\,d\rho`$--->
+$`\displaystyle\hspace{2.6cm}=\dfrac{\dens_0^{3D}}{\epsilon_0}\int \rho\,d\rho`$
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 $`\displaystyle\hspace{2.6cm}=\dfrac{\dens_0^{3D}}{\epsilon_0}\, \dfrac{\rho^2}{2}\,+\,Cst_1`$   
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