add a note for those who are stupid enough to not differentiate between offline and cracked players

Author: HSGamer

src/topper/provider/placeholder/index.md

@@ -37,9 +37,18 @@ holders:
     placeholder: <placeholder>
     # Whether the placeholder should be parsed for online players only (Those who are in the server). Default is true.
     # If set to false, the placeholder will be parsed for all players, even those who are offline.
+    # 
+    # Setting "online" to true ONLY means the plugin would stop updating values for players who are not in the server.
+    # It DOES NOT mean the plugin would remove the value if the player is offline.
+    # It DOES NOT mean that is necessary to make it work with offline-mode / cracked servers.
     online: <true/false>
 ```
 
+> [!IMPORTANT]
+> Setting `online` to `true` **ONLY** means the plugin would stop updating values for players who are not in the server.
+> It **DOES NOT** mean the plugin would remove the value if the player is offline.
+> It **DOES NOT** mean that is necessary to make it work with offline-mode / cracked servers.
+
 == FabricMC
 > [!NOTE]
 > The placeholders are provided by [Text Placeholder API](https://modrinth.com/mod/placeholder-api)