Update microsoft-edge/web-platform/release-notes/135.md

Co-authored-by: Michael Hoffman <v-mihoffman@microsoft.com>

Author: captainbrosset

microsoft-edge/web-platform/release-notes/135.md

@@ -119,6 +119,8 @@ The scroll buttons are used to scroll the container in the direction of the butt
 
 Pseudo-elements that are nested inside other pseudo-elements can now be styled, by using `::before::marker` and `::after::marker`.
 
+`::column::scroll-marker` is not yet supported.
+
 
 <!-- ---------- -->
 ###### CSS `interactivity` property