Add note about older branches in pick_and_place_with_moveit_task_constructor.rst

[Demonmasterlqx]

I use Ubuntu 22.04 and ros2 humble to run the tutorial. When I clone moveit_task_constructor and build, I face many problem because my moveit is humble version. Therefore I look up the tutorial and find this problem.

Description

change branch from ros2 to $ROS_DISTRO

Checklist

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[sea-bass]

ros2 and rolling ($ROSDISTRO) are not quite the same, so typing this in Rolling will fail.

Maybe leave it as is, since the main branch here tracks Rolling, but add a note saying if you're on another ROS distro to clone the appropriate branch of MTC?

[Demonmasterlqx]

ros2 and rolling ($ROSDISTRO) are not quite the same, so typing this in Rolling will fail.

Maybe leave it as is, since the main branch here tracks Rolling, but add a note saying if you're on another ROS distro to clone the appropriate branch of MTC?

I think so. I will add a special claim for ros2 humble user.

[sea-bass]

The build errors seem unrelated.

Also changed the branch name in the humble version of the docs. #1035