Update ui_game_user_interface.rst

Fix Typo

getting_started/step_by_step/ui_game_user_interface.rst

@@ -483,7 +483,7 @@ Now, select the ``TextureProgress`` node. Drag the ``energy_bar_bg.png``
 file onto the ``Under`` slot and do the same for ``energy_bar_fill.png``
 and drop it onto the ``Progress`` texture slot.
 
-you can resize the node vertically so that its bounding rectangle fits
+You can resize the node vertically so that its bounding rectangle fits
 the gauge. Do the same with the ``Count`` node until its size aligns
 with that of the bar. Because the minimal size of ``TextureProgress`` is
 set based on its textures, you won't be able to downsize the ``Count``