Update tutorials/animation/playing_videos.rst

Co-authored-by: A Thousand Ships <[email protected]>

tutorials/animation/playing_videos.rst

@@ -321,7 +321,7 @@ To allow users to manipulate the chroma key effect in real-time, we created slid
         $VideoStreamPlayer.material.set("shader_parameter/chroma_key_color", color)
 
     func _on_h_slider_value_changed(value):
-        # Update the "pickup_range" shader parameter of the VideoStreamPlayer's material
+        # Update the "pickup_range" shader parameter of the VideoStreamPlayer's material.
         $VideoStreamPlayer.material.set("shader_parameter/pickup_range", value)
 
     func _on_h_slider_2_value_changed(value):