docs/core-api: swiotlb: fix typos

Correct references to swiotlb_tbl_map_single() and
swiotlb_tbl_unmap_single() in the documentation for swiotlb.

Fix two small typos that went unnoticed in commit c93f261
("Documentation/core-api: add swiotlb documentation"):
swiotlb_tlb_map_single --> swiotlb_tbl_map_single
swiotbl_tlb_unmap_single --> swiotlb_tbl_unmap_single

Signed-off-by: Eder Zulian <ezulian@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241014224026.1838525-1-ezulian@redhat.com

Author: efzrh

Documentation/core-api/swiotlb.rst

@@ -295,9 +295,9 @@ slot set.
 
 Fourth, the io_tlb_slot array keeps track of any "padding slots" allocated to
 meet alloc_align_mask requirements described above. When
-swiotlb_tlb_map_single() allocates bounce buffer space to meet alloc_align_mask
+swiotlb_tbl_map_single() allocates bounce buffer space to meet alloc_align_mask
 requirements, it may allocate pre-padding space across zero or more slots. But
-when swiotbl_tlb_unmap_single() is called with the bounce buffer address, the
+when swiotlb_tbl_unmap_single() is called with the bounce buffer address, the
 alloc_align_mask value that governed the allocation, and therefore the
 allocation of any padding slots, is not known. The "pad_slots" field records
 the number of padding slots so that swiotlb_tbl_unmap_single() can free them.