add on_replaced block event and on_block_replaced world event

doc/en/scripting/events.md

@@ -16,6 +16,12 @@ function on_broken(x, y, z, playerid)
 
 Called on block broken by player
 
+```lua
+function on_replaced(x, y, z, playerid)
+```
+
+Called on block replaced with other by player
+
 ```lua
 function on_interact(x, y, z, playerid) -> bool
 ```