Update cheatsheet.fr.md

01.curriculum/01.physics-chemistry-biology/03.niv3/05.math-tools-for-physics/04.differential-operators/04.curl/cheatsheet.fr.md

@@ -1,7 +1,10 @@
 ---
 title : the curl vector
-published : false
-visible : false
+published : true
+visible : true
+lessons:
+  - slug: gravitation-electrostat-magnetostat
+  - order:1
 ---
 ## L'opérateur rotationnel