Update Matrix3.html

Update mat3 docs to clarify value orientation

docs/api/math/Matrix3.html

@@ -28,7 +28,7 @@
 		n33 -- todo
 		</div>
 		<div>
-		todo
+		Initialize the 3x3 matrix with a row-major sequence of values.
 		</div>
 
 
@@ -37,7 +37,7 @@
 
 		<h3>.[page:Float32Array elements]</h3>
 		<div>
-		Float32Array with matrix values.
+		Float32Array with column-major matrix values.
 		</div>
 
 
@@ -72,7 +72,7 @@
 		n33 -- todo
 		</div>
 		<div>
-		todo
+		Set the 3x3 matrix values to the given row-major sequence of values.
 		</div>
 
 		<h3>.multiplyScalar([page:todo s]) [page:todo]</h3>