Update textbook.en.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/05.first-steps/textbook.en.md

@@ -50,7 +50,7 @@ starting with three initials in brackets that represent you :
 (CLM): previous comment.<br>
 *(my initials): my comment* 
 
-To **communicate my proposals**, either:
+To **communicate my proposals**, either:<br>
 * Directly on the *GitLab M3P2*:<br>
 <details>
 <summary> 
@@ -61,7 +61,6 @@ Only for those who have an M3P2 account and have received the little introductio
    - Login with your username / password
 </details>
 
-
 * On the *Google Docs M3P2*: to be specified.
 
 The Gitlab will be kept up to date with your proposals, also translated into English and Spanish.<br>