implement changes accepted in the 2021 VGM motion 3

Source of the proposal: https://scipost.org/forums/VGM_EdCol_2021-03/#post107

Of note: I slightly modified the text compared to the original proposal, replacing the last change with changes for correctness purposes.

scipost_django/scipost/templates/scipost/EdCol_by-laws.html

@@ -194,7 +194,7 @@
               using our online forums/meetings facilities.
             </p>
             <ol>
-              <li><strong>Virtual General Meetings</strong>
+              <li><strong>Annual Meetings</strong>
                 <p>Once per year, Fellows of the Editorial Colleges are asked to participate in a
                   virtual general meeting. The meeting is organized by the Foundation and takes
                   place over the course of one week during the month of January.</p>
@@ -216,11 +216,12 @@
                   implementing the decisions taken
                   and releases the minutes of the VGM to the Advisory Board and Editorial College.</p>
               </li>
-              <li><strong>Extraordinary Virtual Meetings</strong>
-                <p>At any time, the Foundation can call an Extraordinary Virtual Meeting, to
-                  discuss pressing issues. This meeting must be
-                  announced at least one week before its scheduled start.
-                  An EVM otherwise follows the same procedures as a VGM.
+              <li><strong>Special Meetings</strong>
+                <p>At any time the Foundation or groups of at least five current editorial college
+                  fellows can call a Special Meeting, to put forward a motion for SciPost policy
+                  changes. This meeting must be announced at least one week before its scheduled
+                  start. The voting for the policy changes follows the same procedure as during
+                  the Annual Meeting.
                 </p>
               </li>
             </ol>