Update cheatsheet.fr.md

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

@@ -207,7 +207,7 @@ $`\left.\begin{array}{l}
 $`\Longrightarrow`$
 **$`\begin{array}{l}
     \\
- \mathbf{\displaystyle\;\,\oint_{\,\Gamma\leftrightarrow S} \overrightarrow{B}\cdot\overrightarrow{dl}—`$$`\mathbf{= 
+ \mathbf{\displaystyle\;\,\oint_{\,\Gamma\leftrightarrow S} \overrightarrow{B}\cdot\overrightarrow{dl}= 
 \mu_0\iint_S \overrightarrow{j}\cdot\overrightarrow{dS} +
  \mu_0 \epsilon_0\dfrac{d}{dt}\iint_S\overrightarrow{E}\cdot\overrightarrow{dS}}
 \end{array}`$**