Add stop environment permissions and remove delete

[ci skip]

doc/user/permissions.md

@@ -33,7 +33,7 @@ The following table depicts the various user permission levels in a project.
 | See a container registry              |         | ✓          | ✓           | ✓        | ✓      |
 | See environments                      |         | ✓          | ✓           | ✓        | ✓      |
 | Create new environments               |         |            | ✓           | ✓        | ✓      |
-| Delete environments                   |         |            |             | ✓        | ✓      |
+| Stop environments                     |         |            | ✓           | ✓        | ✓      |
 | See a list of merge requests          |         | ✓          | ✓           | ✓        | ✓      |
 | Manage/Accept merge requests          |         |            | ✓           | ✓        | ✓      |
 | Create new merge request              |         |            | ✓           | ✓        | ✓      |