Update cheatsheet.fr.md

12.temporary_ins/20.magnetostatics-vacuum/40.ampere-theorem-applications/30.cylindrical-current-distributions/10.rectilinear-current/20.ampere-local/20.overview/cheatsheet.fr.md

@@ -213,16 +213,16 @@ $`\begin{align}
 \dfrac{1}{\rho}\,\left(\dfrac{\partial (\rho\,B_{\varphi})}{\partial \rho}\;-\;\dfrac{\partial B_{\rho}}{\partial \varphi}\right)
 \end{align}`$   
 <br>
-$`\begin{align}
+$`\mathbf{\begin{align}
 \overrightarrow{rot}\,\overrightarrow{B}
 &=\left(\dfrac{1}{\rho}\,\dfrac{\partial B_z}{\partial\varphi}\;-\;\dfrac{\partial B_{\varphi}}{\partial z}\right)\,\overrightarrow{e_{\rho}}\\
 \\
-&\;+\left(\dfrac{\partial B_{\rho}}{\partial z}\;-\;\dfrac{\partial B_z}{\partial \rho}\right)\,overrightarrow{e_{\varphi}}\\
+&\quad +\left(\dfrac{\partial B_{\rho}}{\partial z}\;-\;\dfrac{\partial B_z}{\partial \rho}\right)\,\overrightarrow{e_{\varphi}}\\
 \\
-&\;+
+&\quad +
 \dfrac{1}{\rho}\,\left(\dfrac{\partial (\rho\,B_{\varphi})}{\partial \rho}\;-\;\dfrac{\partial B_{\rho}}{\partial \varphi}\right)
 \,\overrightarrow{e_z}
-\end{align}`$
+\end{align}}`$
 
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