[RTR] same_marker_velocity and docstrings scooted

[Ipuch]

some more docs

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This change is 

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (d3764bb) 81.81% compared to head (cbd9e2e) 81.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #687      +/-   ##
==========================================
+ Coverage   81.81%   81.83%   +0.01%     
==========================================
  Files         112      112              
  Lines       12953    12967      +14     
==========================================
+ Hits        10598    10612      +14     
  Misses       2355     2355              

Impacted Files	Coverage Δ
bioptim/dynamics/configure_problem.py	90.92% <100.00%> (ø)
bioptim/limits/constraints.py	79.60% <100.00%> (+0.08%)	⬆️
bioptim/limits/objective_functions.py	92.22% <100.00%> (+0.04%)	⬆️
bioptim/limits/penalty.py	90.03% <100.00%> (+0.37%)	⬆️

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[pariterre]

Add a test

Reviewed 1 of 1 files at r1, 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Ipuch)

[pariterre]

Reviewed 3 of 3 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Ipuch)