Update cheatsheet.en.md

12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/20.overview/cheatsheet.en.md

@@ -19,11 +19,10 @@ $`\def\PSopen{\mathscr{S}_{\smile}}`$
 $`\def\PSclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
 
 !!!! *LESSON  IN  CONSTRUCTION :* <br>
-!!!! *Not published, not visible, not yet approved*<br>
+!!!! Published but invisible: does not appear in the tree structure of the m3p2.com site. This course is *under construction*, it is *not approved by the pedagogical team* at this stage. <br>
 !!!! work document only for the pedagogical team.
 
-
-<!--MétaDonnée : INSAT-1°année_-->
+<!--MétaDonnée : INS-1°année_-->
 
 
 #### What are ... ?