Update neo_maps.md

Author: Matyrobbrt

docs/datamaps/neo_maps.md

@@ -8,21 +8,17 @@ This data map is located at `neoforged/data_maps/item/compostables.json` and its
 ```js
 {
     // A 0 to 1 (inclusive) float representing the chance that the item will update the level of the composter
-    "chance": 1,
-
-    // A 1 to 7 integer that indicates how many levels should be added to the composter when the item is successfully composted. Defaults to 1 level.
-    "amount": 1 // int
+    "chance": 1
 }
 ```
 
 Example:
 ```js
 {
     "values": {
-        // Give acacia logs a 50% chance that they will fill a composter with 2 levels
+        // Give acacia logs a 50% chance that they will fill a composter
         "minecraft:acacia_log": {
-            "chance": 0.5,
-            "amount": 2
+            "chance": 0.5
         }
     }
 }