Update Matrix4.html

Fix typo.

docs/api/en/math/Matrix4.html

@@ -138,7 +138,7 @@ m.elements = [ 11, 21, 31, 41,
 
 		<h3>[method:null decompose]( [param:Vector3 position], [param:Quaternion quaternion], [param:Vector3 scale] )</h3>
 		<p>
-		Decomposes this matrix into it's [page:Vector3 position], [page:Quaternion quaternion] and [page:Vector3 scale] components.<br/><br/>
+		Decomposes this matrix into its [page:Vector3 position], [page:Quaternion quaternion] and [page:Vector3 scale] components.<br/><br/>
 		Note: Not all matrices are decomposable in this way. For example, if an object has a non-uniformly scaled parent, then the object's world matrix may not be decomposable, and this method may not be appropriate.
 		</p>