docs: fix alloc stop no_shutdown_delay (#16282)

website/content/api-docs/allocations.mdx

@@ -647,6 +647,11 @@ The table below shows this endpoint's support for
   must be the full UUID, not the short 8-character one. This is specified as
   part of the path.
 
+- `no_shutdown_delay` `(bool: false)` - Ignore the group and task
+  [`shutdown_delay`] configuration so that there is no delay between service
+  deregistration and task shutdown. Note that using this parameter will result
+  in failed network connections to the allocation being stopped.
+
 ### Sample Request
 
 ```shell-session
@@ -905,3 +910,5 @@ $ curl \
   }
 ]
 ```
+
+[`shutdown_delay`]: /nomad/docs/job-specification/group#shutdown_delay