Make output of joint limits nicer.

[destogl]

Correct spaces in debug output for joint limits.

Does anybody has some idea what to add instead of [] to put values inside and make output a bit nicer? I find this currently hard to read. Should we add something like (value: xy)

The output now looks like as follows:

[ros2_control_node-3]   has position limits: false [nan, nan]
[ros2_control_node-3]   has velocity limits: true [1]
[ros2_control_node-3]   has acceleration limits: true [1]
[ros2_control_node-3]   has jerk limits: true [10]
[ros2_control_node-3]   has effort limits: false [nan]
[ros2_control_node-3]   angle wraparound: false

[bmagyar]

me likes