feat(docs): update features.md for spoiler container syntax

jackycute · web-flow · commit 969189b900cd · 2019-08-08T16:22:44.000+08:00
Signed-off-by: Max Wu &lt;jackymaxj@gmail.com&gt;
diff --git a/public/docs/features.md b/public/docs/features.md
@@ -371,6 +371,10 @@ Watch out :zap:
 Oh No! :fire:
 :::
 
+:::spoiler Click to show details
+You found me :stuck_out_tongue_winking_eye:
+:::
+
 ## Typography
 
 ### Headers
