Update cheatsheet.fr.md

12.temporary_ins/90.electromagnetism-in-vacuum/30.maxwell-electromagnetism-potentials/cheatsheet.fr.md

@@ -119,7 +119,7 @@ $`\color{blue}{\scriptsize{\left.\begin{align} &\forall \overrightarrow{V}\,,\,
   &div\,\overrightarrow{U}=0\end{align}\right\}\Longrightarrow
   \exists\overrightarrow{V}\,,\, \overrightarrow{U}=\overrightarrow{rot}\,\overrightarrow{V}}}`$   
 <br>
-$`\exists\overrightarrow{A}\,,\, \large{\color{brown}{\overrightarrow{B}=\overrightarrow{rot}\,\overrightarrow{A}}}`$
+$`\exists\overrightarrow{A}\,,\, \large{\mathbf{\color{brown}{\overrightarrow{B}=\overrightarrow{rot}\,\overrightarrow{A}}}}`$
 
 
 * *$`\mathbf{\overrightarrow{rot}\,\overrightarrow{E}=-\dfrac{\partial \overrightarrow{B}}{\partial t}}\quad`$(Maxwell-Faraday)*