Generate documentation for copyWith and toJson

[rekire]

Resolves #1068

I tried to minimize the changes. This PR also corrects the position of the @override for some cases where the override was above the documentation.

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Latest commit: 839bc3bf48ac512124c1776f690f7f659852c38b

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[rekire]

@rrousselGit I noticed that you merged a dependabot PR, so you are working today. Is there anything in my PR I should change?

[rekire]

Sorry I forgot this comment. I'll check that this weekend

[rrousselGit]

Do you still wish to work on this?

[rekire]

To be honest I totally forgot about this PR. I need to check my PR to find out what changes are still required. Might be someone else would be quicker, but I want to finish what I have started. Thank you for the reminder.

[rekire]

@rrousselGit did I catch all the missing parts? The last time I checked the generated code everything was documented. I am not sure why I missed those.

[rrousselGit]

It sounds good. Do you mind refactoring the doc into a getter on data? So that we don't have multiple duplicates of the same doc in the source.

[rekire]

@rrousselGit done