Documentation: btt: Unwrap bit 31-30 nested table

Documentation: btt: Unwrap bit 31-30 nested table

Bit 31-30 usage table is already formatted as reST simple table, but it
is wrapped in literal code block instead. Unwrap it.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20251105124707.44736-2-bagasdotme@gmail.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>