Add note about click in Addon dev/CLI interface

[MustafaJafar]

Is there an existing issue for this?

• I have searched the existing issues.

Please describe the feature you have in mind and explain what the current shortcomings are?

Reported on discord
On your example :
In /server/init.py one of the args is "show-selected-path"
In /client/my_addon/init.py the func is called "show_selected_path"

which is the behavior or click as mentioned in pallets/click#1123

From the Click's github discussion :
You can still use underscores by specifying the command names explicitly. It's just that the default is now to replace with dashses, to look more consistent with other CLI tools, whereas before you would have had to specify those explicitly.

Therefore, we should mention that in cli interface docs.

How would you imagine the implementation of the feature?

.

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Describe alternatives you've considered:

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Additional context:

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