Update wrapping-unwrap.mdx (#20109)

* Update wrapping-unwrap.mdx

It is possible to unwrap data without authentication in Vault. I've added an example of a curl request.

* Add changelog record

changelog/20109.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+sys/wrapping: Add example how to unwrap without authentication in Vault
+```

website/content/api-docs/system/wrapping-unwrap.mdx

@@ -51,6 +51,15 @@ $ curl \
     http://127.0.0.1:8200/v1/sys/wrapping/unwrap
 ```
 
+Or you can use token to unwrap without authentication in vault
+
+```shell-session
+$ curl \
+    --header "X-Vault-Token: abcd1234..." \
+    --request POST \
+    http://127.0.0.1:8200/v1/sys/wrapping/unwrap
+```
+
 ### Sample Response
 
 ```json