Unclear documentation on Permission and Roles
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### Problem to solve
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The [Permissions and roles](https://docs.gitlab.com/ee/user/permissions.html#project-members-permissions) documentation is rather unclear.
In the table it looks like that `guest` users are able to view & pull project code.

There is a `(1)` remark which mentions something about self-hosted and refers to [GitLab.com visibility settings](https://docs.gitlab.com/ee/user/gitlab_com/index.html#visibility-settings) for the SaaS.
This section in its turn only tells us that some items have their internal visibility disabled.
TLDR: The table indicates guest users are able to clone/view the project code, but it appears they can't
### Further details
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### Proposal
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Remove the checkmarks for guests being able to pull code or improve the `(1)` remark details.
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