docs: fix table alignment

doc/api/issues.md

@@ -324,7 +324,7 @@ POST /projects/:id/issues
 | `milestone_id`  | integer | no  | The ID of a milestone to assign issue |
 | `labels`        | string  | no  | Comma-separated label names for an issue  |
 | `created_at`    | string  | no  | Date time string, ISO 8601 formatted, e.g. `2016-03-11T03:45:40Z` (requires admin or project owner rights) |
-| `due_date`      | string  | no   | Date time string in the format YEAR-MONTH-DAY, e.g. `2016-03-11` |
+| `due_date`      | string  | no  | Date time string in the format YEAR-MONTH-DAY, e.g. `2016-03-11` |
 
 ```bash
 curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/projects/4/issues?title=Issues%20with%20auth&labels=bug
@@ -385,7 +385,7 @@ PUT /projects/:id/issues/:issue_id
 | `labels`        | string  | no  | Comma-separated label names for an issue  |
 | `state_event`   | string  | no  | The state event of an issue. Set `close` to close the issue and `reopen` to reopen it |
 | `updated_at`    | string  | no  | Date time string, ISO 8601 formatted, e.g. `2016-03-11T03:45:40Z` (requires admin or project owner rights) |
-| `due_date`      | string  | no   | Date time string in the format YEAR-MONTH-DAY, e.g. `2016-03-11` |
+| `due_date`      | string  | no  | Date time string in the format YEAR-MONTH-DAY, e.g. `2016-03-11` |
 
 ```bash
 curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/projects/4/issues/85?state_event=close