Example wasn't updated with api change (elastic#199667)

monitor api's have been moved under /api/synthetics

---------

Co-authored-by: Shahzad <[email protected]>

Author: mjmbischoff

docs/api/synthetics/private-locations/create-private-location.asciidoc

@@ -44,7 +44,7 @@ Here is an example of a POST request to create a private location:
 
 [source,sh]
 --------------------------------------------------
-POST /api/private_locations
+POST /api/synthetics/private_locations
 {
   "label": "Private Location 1",
   "agentPolicyId": "abcd1234",

docs/api/synthetics/private-locations/delete-private-location.asciidoc

@@ -31,11 +31,11 @@ Here is an example of a DELETE request to delete a private location:
 
 [source,sh]
 --------------------------------------------------
-DELETE /api/private-locations/<location_id>
+DELETE /api/synthetics/private-locations/<location_id>
 --------------------------------------------------
 
 The API does not return a response body for deletion, but it will return an appropriate status code upon successful deletion.
 
 This API will delete the private location with the specified `locationId`.
 
-A location cannot be deleted if it has associated monitors in use. You must delete all monitors associated with the location before deleting the location.
+A location cannot be deleted if it has associated monitors in use. You must delete all monitors associated with the location before deleting the location.