Update doxygen comments for distance() and interpolate()

[AndyZe]

Port this commit from MoveIt1 to MoveIt2

[tylerjw]

Looks like test_launch_move_group_ompl_constraints failed. That test seems a bit flaky, I'd just run this again.

[codecov]

Codecov Report

Merging #401 (a77f844) into main (855db9e) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #401      +/-   ##
==========================================
+ Coverage   53.04%   53.04%   +0.01%     
==========================================
  Files         212      212              
  Lines       22612    22612              
==========================================
+ Hits        11992    11993       +1     
+ Misses      10620    10619       -1     

Impacted Files	Coverage Δ
...bot_model/include/moveit/robot_model/robot_model.h	92.86% <ø> (ø)
...bot_state/include/moveit/robot_state/robot_state.h	88.89% <ø> (ø)
...meterization/work_space/pose_model_state_space.cpp	81.14% <0.00%> (-1.25%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	56.24% <0.00%> (+0.13%)	⬆️
...e/collision_detection_fcl/src/collision_common.cpp	75.19% <0.00%> (+0.50%)	⬆️

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