Modify docs to reflect minor change in instances describe command (#21784)

* Modify docs to reflect minor change in `instances describe` command

* Update src/content/docs/workers/wrangler/commands.mdx

Co-authored-by: Victor Berchet <[email protected]>

---------

Co-authored-by: Victor Berchet <[email protected]>

Author: Caio-Nogueira

src/content/docs/workers/wrangler/commands.mdx

@@ -772,13 +772,13 @@ wrangler workflows instances list <WORKFLOW_NAME> [OPTIONS]
 Describe a specific instance of a Workflow, including its current status, any persisted state, and per-step outputs.
 
 ```sh
-wrangler workflows instances describe <WORKFLOW_NAME> <ID> [OPTIONS]
+wrangler workflows instances describe <WORKFLOW_NAME> [ID] [OPTIONS]
 ```
 
 - `WORKFLOW_NAME` <Type text="string" /> <MetaInfo text="required" />
   - The name of a registered Workflow.
-- `ID` <Type text="string" /> <MetaInfo text="required" />
-  - The ID of a Workflow instance. You can optionally provide `latest` to refer to the most recently created instance of a Workflow.
+- `ID` <Type text="string" /> <MetaInfo text="(default: latest) optional" />
+  - The ID of a Workflow instance. You can optionally provide `latest` to refer to the most recently created instance of a Workflow. Defaults to `latest` if no ID is provided.
 
 <Render file="wrangler-commands/global-flags" product="workers" />