Merge branch 'hchouraria-docs-pipeline-subscriptions-permission-requirement' into 'master'

Docs: Pipeline subscription needs developer permissions

See merge request gitlab-org/gitlab!55989

doc/ci/multi_project_pipelines.md

@@ -324,8 +324,9 @@ now trigger a pipeline on the current project's default branch. The maximum
 number of upstream pipeline subscriptions is 2 by default, for both the upstream and
 downstream projects. This [application limit](../administration/instance_limits.md#number-of-cicd-subscriptions-to-a-project) can be changed on self-managed instances by a GitLab administrator.
 
-The upstream project needs to be [public](../public_access/public_access.md) for
-pipeline subscription to work.
+The upstream project needs to be [public](../public_access/public_access.md)
+and the user must have [developer permissions](../user/permissions.md#project-members-permissions)
+for the upstream project.
 
 ## Downstream private projects confidentiality concern