docs: update IssuesEvent action values

Author: myshkin451

data/reusables/webhooks/issue_event_api_properties.md

@@ -1,7 +1,7 @@
 Key | Type | Description
 ----|------|-------------
 | {% ifversion fpt or ghec %} |
-`action`|`string` | The action that was performed. Can be one of `opened`, `closed`, `reopened`.
+`action`|`string` | The action that was performed. Can be one of `opened`, `closed`, `reopened`, `assigned`, `unassigned`, `labeled`, or `unlabeled`.
 | {% else %} |
 `action`|`string` | The action that was performed. Can be one of `opened`, `closed`, `reopened`, `assigned`, `unassigned`, `labeled`, or `unlabeled`.
 | {% endif %} |

data/reusables/webhooks/issue_properties.md

@@ -2,6 +2,6 @@
 | {% ifversion fpt or ghec %} |
 `assignee`|`object` | The optional user who was assigned or unassigned from the issue.
 `assignees`|`array` | The optional array of assignee objects detailing the assignees on the issue.
-`label`|`object` | The optional label that was added or removed from the issue.
-`labels`|`array` | The optional array of label objects describing the labels on the issue.
+`label`|`object` | The optional label that was added to or removed from the issue if the action was `labeled` or `unlabeled`.
+`labels`|`array` | The optional array of label objects describing the labels on the issue if the action was `labeled` or `unlabeled`.
 | {% endif %} |