Update annex.fr.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/instructions-for-levels/30.beyond/annex.fr.md

@@ -170,10 +170,10 @@ Sont proposées les catégories suivantes, mais à débattre, toutes les idées
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 ! <summary>
 ! What is the optical system giving the image of the painting?
-! <br>
+! <br><br>
 ! </summary>
 ! * The optical system is composed of two spherical refracting surfaces, centered on the same optical axis.
-! <br>
+! <br><br>
 ! </details>
 ! <details markdown=1>
 ! <summary>