chore(docs): added another attribute according to #1209 #1207

Author: Maximilian Franzke

packages/docs/src/docs/pattern-documenting.md

@@ -46,5 +46,5 @@ We'd name our documentation file:
 
 ## Adding More Attributes to the Front Matter
 
-A future update of Pattern Lab will support more front matter attributes including: order, hidden and links.
+A future update of Pattern Lab will support more front matter attributes including: excludeFromStyleguide, order, hidden and links.
 It will also support adding custom attributes that could be utilized by plugins. For example, GitHub issues related to patterns.