Update cheatsheet.en.md

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

@@ -25,8 +25,8 @@ $`\def\PSclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
 
 *Lecture under construction*, **not validated**.    
 ![](https://m3p2.com/fr/temporary_ins/images/M3P2-validity-state-EN_L1200.jpg)   
-![](https://m3p2.com/fr/temporary_ins/images/M3P2-maturity-3_L1200.jpg)<details>
-<summary>Stage 3 : in writing : 1/3</summary>  
+![](https://m3p2.com/fr/temporary_ins/images/M3P2-maturity-7_L1200.jpg)<details>
+<summary>Stage 7 : Tested with students</summary>  
 1. Brainstorming
 2. In structuring
 3. In writing : 1/3
@@ -49,7 +49,7 @@ $`\def\PSclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
 
 ### **Maxwell’s Equations**<br>*and the electromagnetic field $`(\overrightarrow{E}, \overrightarrow{B})`$*
 
-<br><br>
+<br>
 [multilingual version : EN , FR , ES](https://m3p2.com/polyglot/temporary_ins/electromagnetism-in-vacuum/maxwell-equations/overview)
 <br>