Fix incorrect example in the documentation for the expand method in Rect2

doc/classes/Rect2.xml

@@ -89,13 +89,13 @@
 				var rect = Rect2(0, 0, 5, 2)
 
 				rect = rect.expand(Vector2(10, 0)) # rect is Rect2(0, 0, 10, 2)
-				rect = rect.expand(Vector2(-5, 5)) # rect is Rect2(-5, 0, 10, 5)
+				rect = rect.expand(Vector2(-5, 5)) # rect is Rect2(-5, 0, 15, 5)
 				[/gdscript]
 				[csharp]
 				var rect = new Rect2(0, 0, 5, 2);
 
 				rect = rect.Expand(new Vector2(10, 0)); // rect is Rect2(0, 0, 10, 2)
-				rect = rect.Expand(new Vector2(-5, 5)); // rect is Rect2(-5, 0, 10, 5)
+				rect = rect.Expand(new Vector2(-5, 5)); // rect is Rect2(-5, 0, 15, 5)
 				[/csharp]
 				[/codeblocks]
 			</description>

doc/classes/Rect2i.xml

@@ -88,13 +88,13 @@
 				var rect = Rect2i(0, 0, 5, 2)
 
 				rect = rect.expand(Vector2i(10, 0)) # rect is Rect2i(0, 0, 10, 2)
-				rect = rect.expand(Vector2i(-5, 5)) # rect is Rect2i(-5, 0, 10, 5)
+				rect = rect.expand(Vector2i(-5, 5)) # rect is Rect2i(-5, 0, 15, 5)
 				[/gdscript]
 				[csharp]
 				var rect = new Rect2I(0, 0, 5, 2);
 
 				rect = rect.Expand(new Vector2I(10, 0)); // rect is Rect2I(0, 0, 10, 2)
-				rect = rect.Expand(new Vector2I(-5, 5)); // rect is Rect2I(-5, 0, 10, 5)
+				rect = rect.Expand(new Vector2I(-5, 5)); // rect is Rect2I(-5, 0, 15, 5)
 				[/csharp]
 				[/codeblocks]
 			</description>