Fixed typos and added spellcheck to CI

[stefan-k]

Well, that was a lot. I really don't know how to write "internal" and "initial".

[codecov-commenter]

Codecov Report

Base: 93.39% // Head: 93.39% // No change to project coverage 👍

Coverage data is based on head (0fe7080) compared to base (938b3ca).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #312   +/-   ##
=======================================
  Coverage   93.39%   93.39%           
=======================================
  Files         119      119           
  Lines       19012    19012           
=======================================
  Hits        17756    17756           
  Misses       1256     1256           

Impacted Files	Coverage Δ
argmin/src/core/observers/slog_logger.rs	98.83% <ø> (ø)
argmin/src/solver/quasinewton/sr1.rs	76.50% <ø> (ø)
argmin/src/solver/quasinewton/sr1_trustregion.rs	72.25% <ø> (ø)
argmin/src/core/checkpointing/mod.rs	66.19% <100.00%> (ø)

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