Commits on Oct 2, 2024

1. Add option to wait for two subscriptions (#4674) …

   * Add option to wait for tso subscriptions since, if following the tutorial to the letter, you will currently have both turtlesim and topic echo subscribed. If you do not do this, sometimes the turtle will move, sometimes it wont - depending on which subscriber the command finds first.
   
   * wip. Requested to change the flow a bit
   
   * As suggested, moved the continuous publishing version to be first, then go into the --once version.
   
   * added some changes recommended by clalancette
   
   * remove annoying blank line
   
   * Update source/Tutorials/Beginner-CLI-Tools/Understanding-ROS2-Topics/Understanding-ROS2-Topics.rst
   
   Co-authored-by: Chris Lalancette <clalancette@gmail.com>
   (cherry picked from commit 9d2907e)

   

   DaveCollinsJr authored and mergify[bot] committed Oct 2, 2024
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