docs: Update positioner readme (#1072)

plugins/positioner/README.md

@@ -73,9 +73,9 @@ fn main() {
 Afterwards all the plugin's APIs are available through the JavaScript guest bindings:
 
 ```javascript
-import { move_window, Position } from "@tauri-apps/plugin-positioner";
+import { moveWindow, Position } from "@tauri-apps/plugin-positioner";
 
-move_window(Position.TopRight);
+moveWindow(Position.TopRight);
 ```
 
 If you only intend on moving the window from rust code, you can import the Window trait extension instead of registering the plugin: