Update permissions documentation

doc/user/permissions.md

@@ -126,6 +126,7 @@ The following table depicts the various user permission levels in a project.
 | Transfer project to another namespace             |         |            |             |          | ✓      |
 | Remove project                                    |         |            |             |          | ✓      |
 | Delete issues                                     |         |            |             |          | ✓      |
+| Disable notification emails                       |         |            |             |          | ✓      |
 | Force push to protected branches (*4*)            |         |            |             |          |        |
 | Remove protected branches (*4*)                   |         |            |             |          |        |
 
@@ -220,6 +221,7 @@ group.
 | Remove group                                    |       |          |           |            | ✓     |
 | Delete group epic **(ULTIMATE)**                |       |          |           |            | ✓     |
 | View group Audit Events                         |       |          |           |            | ✓     |
+| Disable notification emails                     |       |          |           |            | ✓     |
 
 - (1): Groups can be set to [allow either Owners or Owners and
   Maintainers to create subgroups](group/subgroups/index.md#creating-a-subgroup)