Merge branch 'docs-specify-labels-in-project-group' into 'master'

Docs specify labels in project and group list pages

See merge request gitlab-org/gitlab-ce!22886

doc/user/project/labels.md

@@ -19,6 +19,7 @@ A permission level of `Developer` or higher is required to create labels.
 ### New project label
 
 To create a **project label**, navigate to **Issues > Labels** in the project.
+This page only shows project labels in this project and group labels of this project's parent group.
 
 Click the **New label** button. Enter the title, an optional description, and the background color. Click **Create label** to create the label.
 
@@ -33,6 +34,7 @@ GitLab will add the following default labels to the project:
 ### New group label
 
 To create a **group label**, follow similar steps from above to project labels. Navigate to **Issues > Labels** in the group and create it from there.
+This page only shows group labels in this group.
 
 Group labels appear in every label list page of the group's child projects.