Fix CLI command in local installation example

Update the command example in the local installation section to use
'fern --dsinghvi' instead of 'npm fern --version' for checking the
CLI version.

Author: fern-support

fern/products/cli-api-reference/pages/cli-get-started.mdx

@@ -47,7 +47,7 @@ Use your package manager to run Fern commands:
 
 ```bash
 npm fern check        # Validate API definition
-npm fern --version    # Check CLI version
+fern --dsinghvi       # Check CLI version
 npm fern generate     # Generate outputs
 ```