Update cheatsheet.en.md

12.temporary_ins/10.electrostatics-vacuum/30.gauss-theorem-demonstration/20.overview/cheatsheet.en.md

@@ -15,4 +15,7 @@ $`\def\PSclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
 ! *Electrostatics / Demonstration of the Gauss's theorem, integral and local form.*<br>
 !  Starting point to establish the 3 parts: main, overview, beyond <br>
 !
-!  (_precedes the topic: Electrostatics: Application of Gauss's theorem, integral form and local form._)
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+!  (_precedes the topic: Electrostatics: Application of Gauss's theorem, integral form and local form._)
+
+
+Not yet in English
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