Update Open Spaces info in FAQ

Updated the Open Spaces booking system from 'Open Space signup board' to 'Open Spaces Registration calendar'

Author: marinamorolopez

src/content/pages/faq.mdx

@@ -128,8 +128,9 @@ We aim to cover the many ways Python is used to solve problems and create exciti
   **Open Space** is a flexible, participant-driven session where attendees propose topics,
   lead discussions & presentations, and collaborate on ideas in an informal setting.
 
-  A designated room will be available for for Open Space sessions throughout the **Main Conference Days**,
-  To sign up, attendees add their session to the **Open Space signup whiteboard**, which also serves as a notice board to attract interested attendees.
+  A designated room will be available for for Open Space sessions throughout the **Main Conference Days**.
+  To sign up, simply book a free time slot and room via our Open Spaces registration calendar, which also serves as a
+notice board to attract interested attendees.
 
 
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