Update textbook.fr.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/30.n3/12.en/textbook.fr.md

@@ -4,11 +4,11 @@ published: true
 routable: true
 visible: false
 lessons:
-    - slug: brainstorming-234-mathematical-tools
+    - slug: define-234-mathematical-tools
       order: 2
 ---
 
-#### Brainstorming on the mathematical tools required at level 3
+#### Define the mathematical tools required at level 3
 
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