chore: improve propagator doc

[andiwand]

make PDG explicit and improve doc a little

[codecov]

Codecov Report

Merging #2102 (d4a759f) into main (44c343b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2102   +/-   ##
=======================================
  Coverage   49.41%   49.41%           
=======================================
  Files         434      434           
  Lines       24985    24985           
  Branches    11522    11522           
=======================================
  Hits        12347    12347           
  Misses       4486     4486           
  Partials     8152     8152           

Impacted Files	Coverage Δ
Core/include/Acts/Propagator/Propagator.hpp	93.33% <ø> (ø)

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[github-actions]

📊 Physics performance monitoring for d4a759f

Full report
Seeding: seeded, truth estimated, orthogonal
CKF: seeded, truth smeared, truth estimated, orthogonal
IVF: seeded, truth smeared, truth estimated, orthogonal
Ambiguity resolution: seeded, orthogonal
Truth tracking
Truth tracking (GSF)

Vertexing

Vertexing vs. mu

IVF seeded

IVF truth_smeared

IVF truth_estimated

IVF orthogonal

Seeding

Seeding seeded

Seeding truth_estimated

Seeding orthogonal

CKF

CKF seeded

CKF truth_smeared

CKF truth_estimated

CKF orthogonal

Ambiguity resolution

seeded

Truth tracking (Kalman Filter)

Truth tracking

Truth tracking (GSF)

Truth tracking

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