[Servo] Add additional info about twist frame conversion

[ibrahiminfinite]

Description

This PR adds some info for the users about the limitations of twist frame conversion currently used in Servo.

Checklist

• Required by CI: Code is auto formatted using clang-format

Ping : @AndyZe @sea-bass

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: +0.03% 🎉

Comparison is base (92ca89d) 50.69% compared to head (2a88f62) 50.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2295      +/-   ##
==========================================
+ Coverage   50.69%   50.71%   +0.03%     
==========================================
  Files         386      386              
  Lines       31912    31914       +2     
==========================================
+ Hits        16174    16182       +8     
+ Misses      15738    15732       -6     

Files Changed	Coverage Δ
moveit_ros/moveit_servo/src/servo.cpp	66.13% <50.00%> (-0.13%)	⬇️

... and 2 files with indirect coverage changes

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