Update launch_turtlesim_launch.py (#5730)

The extra comma here causes the type of `launch_dir` to change, resulting in an error.

Signed-off-by: today <[email protected]>

Author: rgzntrade

source/Tutorials/Intermediate/Launch/launch/launch_turtlesim_launch.py

@@ -5,7 +5,7 @@
 
 
 def generate_launch_description():
-    launch_dir = PathJoinSubstitution([FindPackageShare('launch_tutorial'), 'launch']),
+    launch_dir = PathJoinSubstitution([FindPackageShare('launch_tutorial'), 'launch'])
     return LaunchDescription([
         IncludeLaunchDescription(
             PathJoinSubstitution([launch_dir, 'turtlesim_world_1.launch.py'])