Update cheatsheet.fr.md

12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

@@ -206,6 +206,7 @@ $`\left.\begin{array}{l}
 \iint_{S} \;\overrightarrow{rot}\;\overrightarrow{B} \cdot dS = \oint_{\,\Gamma\leftrightarrow S} \overrightarrow{B}\cdot\overrightarrow{dl}
 \end{array}\right\}`$
 $`\Longrightarrow`$
+
 **$` \mathbf{\displaystyle\;\,\oint_{\,\Gamma\leftrightarrow S} \overrightarrow{B}\cdot\overrightarrow{dl}}`$
 $`\;\mathbf{= \mu_0\iint_S \overrightarrow{j}\cdot\overrightarrow{dS} +\mu_0 \epsilon_0\dfrac{d}{dt}\iint_S\overrightarrow{E}\cdot\overrightarrow{dS}}`$**