prime and stage key reference should be fleshed out

[lengau]

What needs to get done

https://canonical-craft-parts.readthedocs-hosted.com/en/latest/common/craft-parts/reference/part_properties.html#stage

This should at least include an example or two of including only certain files or including some files.

Why it needs to get done

@tmihoc pointed this out due to some user questions on Charmcraft

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3767.

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[tmihoc]

Thanks for filing this, @lengau ! I feel the description for each property should also include comments on the value, not just the type. E.g., for prime or stage it should say not just that the type is a string of a certain form but also that it's a path and that you can specify not just paths to be included but also paths to be excluded -- the latter using the symbol -.