Update file sharing_projects_groups.md

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What does this MR do and why?

This MR adds documentation on the behaviour of sharing a group which already contains shared members. This MR should be merged, because it answers questions and resolves confusion that customers have regarding this behaviour.

Customers expect that you can share memberships recursively, but this is not the case in the GitLab application at this moment. This MR makes this clear.

References

There is a commit that removed similar documentation on the Members of a project documentation. To better find the documentation I suggest to have this explained at both locations or link them. The Members of a project documentation should probably focus on the project documentation and the suggestion of this MR focusses on the group documentation.

Screenshots or screen recordings

no UI changes proposed

How to set up and validate locally

Only documentation change.

To check that the behavious of the added documenation is correct you can:

1. Create group a, group b and group c
2. Then add user a as direct member to group c
3. Invite group c in group b
4. Invite group b in group a

You will see that user a shows up in the member list of group b, but not group a. Also the user will not be able to see group a.

MR acceptance checklist

only documentation changes