Add delete issue docs

doc/user/permissions.md

@@ -71,6 +71,7 @@ The following table depicts the various user permission levels in a project.
 | Switch visibility level               |         |            |             |          | ✓      |
 | Transfer project to another namespace |         |            |             |          | ✓      |
 | Remove project                        |         |            |             |          | ✓      |
+| Delete issues                         |         |            |             |          | ✓      |
 | Force push to protected branches [^4] |         |            |             |          |        |
 | Remove protected branches [^4]        |         |            |             |          |        |
 | Remove pages                          |         |            |             |          | ✓      |

doc/user/project/issues/deleting_issues.md

+# Deleting Issues
+
+> [Introduced][ce-2982] in GitLab 8.6
+
+Please read through the [GitLab Issue Documentation](index.md) for an overview on GitLab Issues.
+
+You can delete an issue by editing it and clicking on the delete button. 
+
+![delete issue - button](img/delete_issue.png)
+
+>**Note:** Only [project owners](../../permissions.md) can delete issues. 
\ No newline at end of file

doc/user/project/issues/index.md

@@ -90,6 +90,10 @@ Learn distinct ways to [close issues](closing_issues.md) in GitLab.
 
 Read through the [documentation on moving issues](moving_issues.md).
 
+## Deleting issues
+
+Read through the [documentation on deleting issues](deleting_issues.md)
+
 ## Create a merge request from an issue
 
 Learn more about it on the [GitLab Issues Functionalities documentation](issues_functionalities.md#18-new-merge-request).