"Using parameters in a class" tutorials having inconsistent node names

[jacobperron]

This is more of a nitpick, but the default names of the nodes in the parameter class tutorials are inconsistent. The C++ tutorials uses the name parameter_node and the Python tutorial uses the name param_talker.

I think the names should either be the same or follow the same pattern (i.e. both have the suffix _node or _talker).

Note, I noticed the inconsistency when adapting the launch file from the C++ tutorial that is referenced by the Python tutorial.

Links to tutorials:

• https://index.ros.org/doc/ros2/Tutorials/Using-Parameters-In-A-Class-CPP
• https://index.ros.org/doc/ros2/Tutorials/Using-Parameters-In-A-Class-Python

[MorphyCao]

Based on foxy version:
In C++ the node name is "parameter_node"
In Python the node name is 'minimal_param_node'
I guess this is not a big issue, but agree to make them consistent