Fix TLE writing by adding a newline after the last TLE entry

[pnuu]

The TLE writing didn't add a linechange character after the last TLE entry it writes to a text file causing problems in certain 3rd party software. This PR adds the linechange.

Also, couple of unrelated docstrings were clarified.

• Tests updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.46%. Comparing base (b55ac29) to head (9ec69e6).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #214   +/-   ##
=======================================
  Coverage   90.45%   90.46%           
=======================================
  Files          19       19           
  Lines        3039     3040    +1     
=======================================
+ Hits         2749     2750    +1     
  Misses        290      290           

Flag	Coverage Δ
unittests	90.46% <100.00%> (+<0.01%)	⬆️

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[mraspaud]

LGTM