Update cheatsheet.en.md

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

@@ -125,9 +125,9 @@ $`\def\PSclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
   and expand optics to a *new world: electromagnetic waves*.
 
 ![Maxwell's Equations](Maxwell-equation-en.png)
-*Maxwell modified two of the equations of electrostatics and magnetostatics by
-introducing coupling terms between E and B,
-thus revolutionizing physics.*
+_Maxwell modified two of the equations of electrostatics and magnetostatics by_
+_introducing coupling terms between E and B,_
+_thus revolutionizing physics._
 
 #### Why do we say "equations" and not "theorems" of Maxwell?