Move the documentation from packagedoc headers to README.md for Generators

Move the documentation from packagedoc headers to README.md for Generators

@ewelina

This merge request affects 6 packages:

• Generators/CosmicGenerator
• Generators/GeneratorFilters
• Generators/GeneratorObjectsAthenaPool
• Generators/GeneratorObjectsTPCnv
• Generators/Herwig7_i
• Generators/Hijing_i

Affected files list will not be printed in this case

Adding @gemmeren as watcher

added Generators main review-pending-level-1 labels

added 1 commit

• 710c1d5e - Small textual fix

Compare with previous version

This merge request affects 6 packages:

• Generators/CosmicGenerator
• Generators/GeneratorFilters
• Generators/GeneratorObjectsAthenaPool
• Generators/GeneratorObjectsTPCnv
• Generators/Herwig7_i
• Generators/Hijing_i

Affected files list will not be printed in this case

Adding @gemmeren as watcher

CI Result SUCCESS (hash e206b9f1)

	Athena	AthSimulation	AthGeneration	AthAnalysis
externals
cmake
make
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
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 10124] (remote access info)

CI Result SUCCESS (hash 710c1d5e)

	Athena	AthSimulation	AthGeneration	AthAnalysis
externals
cmake
make
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
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 10126] (remote access info)

Approved from L1

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

merged

mentioned in commit c4afbe72