Update textbook.fr.md

00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/coordinates-systems/main/textbook.fr.md

@@ -184,8 +184,6 @@ pensez à remplacer (auto-tra) par vos initiales (YYY).
 
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-#### Elementos de cursos / Eléments de cours / Course items
-
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 IMPORTANTE / IMPORTANT
 
@@ -207,7 +205,7 @@ between the three languages, explaining it in the course will be important.<br>
 To define a "repère" seems to me important to me to make the distinction between
 "repère" and reference frame...
 -->
-<br><br><br>
+
 
 ### Introducción / Introduction