Internal head schema docstring copied to all generate external schemas

[mrparalon]

Is your feature request related to a problem? Please describe.

Since head schema is not exposed to users directly, it is not obvious that docsting will be copied to all generated schemas. And this docstring is shown in swagger docs. Also I'm not sure, that cadwyn user want same description for all versions.

Describe the solution you'd like
I see different options to solve it

• Disable copy of docstring
• Add warning about it on code generation
• Add setting to disable it
• Migrate docstrings

Additional context
Request come from a case on my current job. We added internal docstring to head schema and it was exposed in swagger

[zmievsa]

Could you explain a use case where the docstring would need to be migrated or be different in between the internal and external schemas? It is not a breaking change.