docs(batch): fix error handling code highlight line number (#7638)

Fixed the highlighted line in the batch processing error handling example
from line 24 (empty line) to line 23 (the actual raise statement). This
ensures the documentation correctly highlights where the InvalidPayload
exception is raised in the error handling example.

Author: ConnorKirk

docs/utilities/batch.md

@@ -243,7 +243,7 @@ By default, we catch any exception raised by your record handler function. This
 
 === "Sample error handling with custom exception"
 
-    ```python title="" hl_lines="24"
+    ```python title="" hl_lines="23"
     --8<-- "examples/batch_processing/src/getting_started_error_handling.py"
     ```