Fix some forgotten lowercase x/y/z

tutorials/math/matrices_and_transforms.rst

@@ -85,8 +85,8 @@ To do this in code, we multiply each of the vectors:
 
     Transform2D t = Transform2D.Identity;
     // Scale
-    t.x *= 2;
-    t.y *= 2;
+    t.X *= 2;
+    t.Y *= 2;
     Transform = t; // Change the node's transform to what we calculated.
 
 If we wanted to return it to its original scale, we can multiply
@@ -324,7 +324,7 @@ As an example, let's set Y to (1, 1):
 
     Transform2D t = Transform2D.Identity;
     // Shear by setting Y to (1, 1)
-    t.y = Vector2.One;
+    t.Y = Vector2.One;
     Transform = t; // Change the node's transform to what we calculated.
 
 .. note:: You can't set the raw values of a Transform2D in the editor,

tutorials/math/vectors_advanced.rst

@@ -189,9 +189,9 @@ degrees to either side:
     // Calculate vector from `a` to `b`.
     var dvec = pointA.DirectionTo(pointB);
     // Rotate 90 degrees.
-    var normal = new Vector2(dvec.y, -dvec.x);
+    var normal = new Vector2(dvec.Y, -dvec.X);
     // Alternatively (depending the desired side of the normal):
-    // var normal = new Vector2(-dvec.y, dvec.x);
+    // var normal = new Vector2(-dvec.Y, dvec.X);
 
 The rest is the same as the previous example. Either point_a or
 point_b will work, as they are in the same plane: