Update cheatsheet.fr.md

12.temporary_ins/90.electromagnetism-in-vacuum/20.electromagnetic-waves-vacuum/20.overview/cheatsheet.fr.md

@@ -215,7 +215,7 @@ puis d'une onde plane progressive monochromatique (OPPM).
   $`\left.
     \begin{align} 
     &\underbrace{\overrightarrow{rot}\,\overrightarrow{B}=
-    \mu_0\,\overrightarrow{j}+\upperbrace{\mu_0\epsilon_0}^{=\;\dfrac{1}{c^2}}\,\dfrac{\partial \overrightarrow{E}}{\partial t}}_{\color{blue}{\text{th. de Maxwell-Faraday}}}
+    \mu_0\,\overrightarrow{j}+\overbrace{\mu_0\epsilon_0}^{=\;\dfrac{1}{c^2}}\,\dfrac{\partial \overrightarrow{E}}{\partial t}}_{\color{blue}{\text{th. de Maxwell-Faraday}}}
      =\dfrac{1}{c^2}\,\dfrac{\partial \overrightarrow{E}}{\partial t}\\
     \\
     &\overrightarrow{B}\;uniforme\\