Update cheatsheet.en.md

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

@@ -465,11 +465,11 @@ I recognize here the law of conservation of charge.
 * The *Divergence Theorem* (= *Gauss's Theorem*) states that for any vector field
   $`\overrightarrow{U}`$ and any volume $`\tau`$,
   *$`\displaystyle\iiint_{\tau} \text{div}\,\overrightarrow{U}\,d\tau=\oiint_S \overrightarrow{U}\cdot dS`$*,
-  $`S`$ being the closed surface bounding the volume $`\tau`$.
+  $`S`$ being the closed surface bounding the volume $`\tau`$.   
   <br>
-  *Applied to the first term* of the equality, we obtain:
+  *Applied to the first term* of the equality, we obtain :
   <br>
-  **$`\displaystyle\oiint_S \overrightarrow{j}\cdot \overrightarrow{dS} + \iiint_{\tau}\dfrac{\partial \dens}{\partial t}\,d\tau=0`** .
+  **$`\displaystyle\oiint_S \overrightarrow{j}\cdot \overrightarrow{dS} + \iiint_{\tau}\dfrac{\partial \dens}{\partial t}\,d\tau=0`$** .
 
 * Noting again that *space and time are independent in classical physics*, the order of derivation or integration with respect to a spatial variable and a time variable does not matter:
   <br>