Fix typos

[johnpaulett]

Summary

• fix typos in container and parser modules
• correct spelling in async MLLP doc

Testing

• python -m unittest discover -t . -s tests
• codespell -q 3 --skip="*.lock" -L SER,OT

---

https://chatgpt.com/codex/tasks/task_b_6843979b6b2c8327b745cae447afc354

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.24%. Comparing base (53f5657) to head (6ec4a06).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #74   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files          20       20           
  Lines        1619     1619           
  Branches      234      234           
=======================================
  Hits         1461     1461           
  Misses        112      112           
  Partials       46       46           

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