Tram docs and a unit test

[MaaikeG]

Thanks for submitting a PR, your contribution is really appreciated!

Here's a quick checklist that should be present in PRs:

• Make sure to include one or more tests for your change
• Add yourself to AUTHORS
• Add a new entry to the doc/source/CHANGELOG. Decide whether your change is a fix or a new feature.

[codecov]

Codecov Report

Merging #188 (3947383) into main (6c0d297) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #188      +/-   ##
==========================================
+ Coverage   93.50%   93.53%   +0.02%     
==========================================
  Files         131      131              
  Lines       10468    10467       -1     
==========================================
+ Hits         9788     9790       +2     
+ Misses        680      677       -3     

Impacted Files	Coverage Δ
deeptime/markov/msm/tram/_tram_dataset.py	95.90% <ø> (-1.19%)	⬇️
deeptime/markov/msm/tram/_tram.py	95.94% <100.00%> (ø)
deeptime/util/callbacks.py	100.00% <0.00%> (+31.25%)	⬆️

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[clonker]

Thanks!