docs: add missing parenthesis to transport code example (#2099)

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

docs/transports.md

@@ -222,7 +222,7 @@ In case you want to both use a custom transport, and output the log entries with
       }
     ]
 
-    const logger = pino(pino.transport({ targets: transports })
+    const logger = pino(pino.transport({ targets: transports }))
 ```
 
 ### Creating a transport pipeline