Documentation: parport-lowlevel: Separate function listing code blocks

Commit be9d041 ("parport-lowlevel.txt: standardize document
format") reSTify parport interface documentation but forgets to properly
mark function listing code blocks up. As such, these are rendered as
long-running normal paragraph instead.

Fix them by adding missing separator between the code block marker and
the listing.

Fixes: be9d041 ("parport-lowlevel.txt: standardize document format")
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20251105124947.45048-1-bagasdotme@gmail.com>

Author: bagasme

Documentation/driver-api/parport-lowlevel.rst

@@ -7,6 +7,7 @@ PARPORT interface documentation
 Described here are the following functions:
 
 Global functions::
+
   parport_register_driver
   parport_unregister_driver
   parport_enumerate
@@ -34,6 +35,7 @@ Global functions::
 Port functions (can be overridden by low-level drivers):
 
   SPP::
+
     port->ops->read_data
     port->ops->write_data
     port->ops->read_status
@@ -46,17 +48,20 @@ Port functions (can be overridden by low-level drivers):
     port->ops->data_reverse
 
   EPP::
+
     port->ops->epp_write_data
     port->ops->epp_read_data
     port->ops->epp_write_addr
     port->ops->epp_read_addr
 
   ECP::
+
     port->ops->ecp_write_data
     port->ops->ecp_read_data
     port->ops->ecp_write_addr
 
   Other::
+
     port->ops->nibble_read_data
     port->ops->byte_read_data
     port->ops->compat_write_data