Documentation: amd-sbi: Wrap miscdevice listing snippet in literal code block

Documentation: amd-sbi: Wrap miscdevice listing snippet in literal code block

Device file listing (ls output) is shown as long-running paragraph
instead. Wrap it in literal code block.

Fixes: 4d95514d14e874 ("misc: amd-sbi: Add document for AMD SB IOCTL description")
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: <20251104041812.31402-2-bagasdotme@gmail.com>