Update textbook.en.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/electromagnetism/n4/textbook.en.md

@@ -53,7 +53,7 @@ _(+ a title if it's a new proposition)_
 
 To **communicate my proposals**, either:
 * directly on the GitLab m3p2 with your login/password: <br>
-if you are not there already, go to https://gitlab.m3p2.com/brainstorming-234-electromagnetism,<br>
+if you are not there already, go to https://m3p2.com/en/lessons/brainstorming-234-electromagnetism,<br>
 and at the end of the page, in the green box click on "Edit this course".
 * on the google drive m3p2 project in the document Brainstorming-1-electromagnetism.docx.
 * or send an email to ... specifying: <br>