Documentation update: Accessibility of merge request public project guest member

Problem to solve

According to https://docs.gitlab.com/ee/user/permissions.html#project-members-permissions, an user should be able to view and create merge requests when all of the following conditions are met:

• public project
• merge request feature set to "Only Project Members"
• user being a guest member of the project

However the current implementation treats this as inaccessible.

I guess this mismatch is a documentation issue, but please double check.

Further details

Proposal

Update the documentation to reflect the actual behavior.

Who can address the issue

Other links/references