docs: passes 2-10 — fix MC overview, modding biomes/enchantments

Author: coah80

src/content/docs/mc/overview.md

@@ -60,4 +60,4 @@ A `Redstone` constants class defining signal range (`SIGNAL_NONE = 0`, `SIGNAL_M
 
 ### Behavior and dispense registry
 
-A `Behavior` base class and `BehaviorRegistry` that maps `Item` pointers to `DispenseItemBehavior` instances, with a default no-op fallback. Used by the `DispenserBootstrap` to register item-specific dispense actions at startup.
+A `Behavior` base class and `BehaviorRegistry` that maps `Item` pointers to `DispenseItemBehavior` instances, with a `DefaultDispenseItemBehavior` fallback (drops items as pickups). Used by the `DispenserBootstrap` to register item-specific dispense actions at startup.

src/content/docs/modding/adding-biomes.md

@@ -233,7 +233,7 @@ Feature *MyBiome::getTreeFeature(Random *random)
 }
 ```
 
-Available tree features: `TreeFeature` (normal oak), `BasicTree` (fancy oak), `BirchFeature`, `SwampTreeFeature`, `BigTreeFeature` (jungle trees).
+Available tree features: `TreeFeature` (normal oak), `BasicTree` (fancy oak), `BirchFeature`, `SwampTreeFeature`, `MegaTreeFeature` (large 2x2 jungle trees).
 
 ### Custom Decoration Override
 

src/content/docs/modding/adding-enchantments.md

@@ -386,9 +386,9 @@ int getEnchantmentCost(Random *random, int slot,
                  + (bookcases >> 1)
                  + random->nextInt(bookcases + 1);
 
-    if (slot == 0) return max(selected / 3, 1);  // Cheap slot
-    if (slot == 1) return max(selected, bookcases * 2);  // Mid
-    return selected;                               // Expensive slot
+    if (slot == 0) return max(selected / 3, 1);  // Top slot (cheapest)
+    if (slot == 1) return max(selected, bookcases * 2);  // Middle slot (guaranteed minimum)
+    return selected;                               // Bottom slot (raw value)
 }
 ```