Fix broken link to MSG interpretation guide

[gerritholl]

Fix the broken link to the MSG interpretation guide.

• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.28%. Comparing base (aa54516) to head (c1283c6).
Report is 35 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #254   +/-   ##
=======================================
  Coverage   90.28%   90.28%           
=======================================
  Files          22       22           
  Lines        2523     2523           
=======================================
  Hits         2278     2278           
  Misses        245      245           

Flag	Coverage Δ
unittests	90.28% <ø> (-0.22%)	⬇️

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[adybbroe]

LGTM, very good, thanks!