Add documentation regarding the --package argument

[betulependule]

Merge after #2850

[softwarefactory-project-zuul]

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[lbarcziova]

thanks!

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[betulependule]

Note: The latest force push changed the specified order of arguments in the --package argument-related docs. A note has also been added to the docs to mention that the order of arguments is important and shouldn't be switched.

I will probably merge this on Monday so that the docs reflect the change at around the same time as deployment takes place.

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[majamassarini]

🙏🏻

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