Add documentation for /param2

ChatCommands.md

@@ -116,6 +116,10 @@ Set the current WorldEdit region to `<node>`.
     //set Blue Lightstone
     //set dirt with grass
 
+### `//param2 <param2>`
+
+Set the param2 value of all nodes in the current WorldEdit region to `<param2>`.
+
 ### `//mix <node1> ...`
 
 Fill the current WorldEdit region with a random mix of `<node1>`, `...`.
@@ -432,4 +436,4 @@ or vertically in the y axis `[v]`.
 Contracts the selection in all directions by `<amount>`. If specified, the selection can be contracted horizontally in the x and z axes `[h]`
 or vertically in the y axis `[v]`.
 
-		//outset v 5
+		//outset v 5