added delete role to website documentation (#27883)

* added delete role to website documentation

* added changlog

changelog/27883.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+website/docs: Added API documentation for Azure Secrets Engine delete role
+```

website/content/api-docs/secret/azure.mdx

@@ -295,6 +295,29 @@ $ vault list azure/roles
 }
 ```
 
+## Delete role
+
+This endpoint deletes an existing role by the given name. If the role does not
+exist, a 404 is returned.
+
+| Method   | Path               |
+| :------- | :----------------- |
+| `DELETE` | `/azure/roles/:name` |
+
+### Parameters
+
+- `name` `(string: <required>)` – Specifies the name of the role to delete. This
+  is part of the request URL.
+
+### Sample request
+
+```shell-session
+$ curl \
+    --header "X-Vault-Token: ..." \
+    --request DELETE \
+    http://127.0.0.1:8200/v1/azure/roles/example-role
+```
+
 ## Generate credentials
 
 This endpoint generates a new service principal based on the named role.