Add partition field for catalog deregister docs (#21788)

* Add partition field for catalog deregister docs

* Update website/content/api-docs/catalog.mdx

Co-authored-by: Jeff Boruszak <104028618+boruszak@users.noreply.github.com>

---------

Co-authored-by: Jeff Boruszak <104028618+boruszak@users.noreply.github.com>

website/content/api-docs/catalog.mdx

@@ -212,6 +212,8 @@ The behavior of the endpoint depends on what keys are provided.
   You can also specify the namespace in the `Service` or `Check` fields;
   if namespaces are specified in multiple places, they must all be the same.
 
+- `Partition` `(string: "")` <EnterpriseAlert inline /> - Specifies the admin partition of the service and checks you deregister.
+
 ### Sample Payloads
 
 ```json
@@ -221,6 +223,14 @@ The behavior of the endpoint depends on what keys are provided.
 }
 ```
 
+```json
+{
+  "Datacenter": "dc1",
+  "Node": "t2.320",
+  "Partition": "part-1"
+}
+```
+
 ```json
 {
   "Datacenter": "dc1",