Update group permissions table documentation

doc/user/permissions.md

@@ -205,7 +205,7 @@ the group. The following table depicts the various user permission levels in a
 group.
 
 | Action                                                 | Guest | Reporter | Developer | Maintainer | Owner |
-|-------------------------------------------------|-------|----------|-----------|------------|-------|
+|--------------------------------------------------------|-------|----------|-----------|------------|-------|
 | Browse group                                           | ✓     | ✓        | ✓         | ✓          | ✓     |
 | View Insights charts **(ULTIMATE)**                    | ✓     | ✓        | ✓         | ✓          | ✓     |
 | View group epic **(ULTIMATE)**                         | ✓     | ✓        | ✓         | ✓          | ✓     |
@@ -220,11 +220,13 @@ group.
 | Manage group members                                   |       |          |           |            | ✓     |
 | Remove group                                           |       |          |           |            | ✓     |
 | Delete group epic **(ULTIMATE)**                       |       |          |           |            | ✓     |
+| Edit epic comments (posted by any user) **(ULTIMATE)** |       |          |           | ✓ (2)      | ✓ (2) |
 | 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)
+- (2): Introduced in GitLab 12.2.
 
 ### Subgroup permissions