Update links

Author: vivienlacourba

editor/role.md

@@ -5,7 +5,7 @@ toc: false
 
 The role of the editor is not that of author. They maintain the text of a current draft that the Group has agreed to and possibly to suggest concrete wording when none is forthcoming from the group.
 
-Specification editors are [appointed by the Group Chair](../chair/role.html).
+Specification editors are [appointed by the Group Chair](../chair/role.md).
 
 ## Role of the editor