Documentation: genpt: Don't use code block marker before iommu_amdv1.c include listing

Documentation: genpt: Don't use code block marker before iommu_amdv1.c include listing

Stephen Rothwell reports htmldocs warning when merging iommu tree:

Documentation/driver-api/generic_pt.rst:32: WARNING: Literal block expected; none found. [docutils]

This is because of duplicate double colon code block markers: one after
generic_pt/fmt/iommu_amdv1.c and the one in its preceding paragraph. The
resulting htmldocs, however, only marks the include listing (after the
former) up as it should be.

Drop the latter to fix the warning.

Fixes: ab0b572847ac ("genpt: Add Documentation/ files")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/linux-next/20251106143925.578e411b@canb.auug.org.au/
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>