BFieldMesh expand comments (part II)

BFieldMesh following feedback from @schaffer

This merge request affects 1 package:

• MagneticField/MagFieldElements

This merge request affects 2 files:

• MagneticField/MagFieldElements/MagFieldElements/BFieldMesh.h
• MagneticField/MagFieldElements/MagFieldElements/BFieldZone.h

added Magnets master review-pending-level-1 labels

CI Result SUCCESS (hash ecb83b7f)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 44574]

added review-approved label and removed review-pending-level-1 label

mentioned in merge request !49357 (merged)

merged

mentioned in commit 50cf58f7

added sweep:ignore label