scatterlist: fix incorrect func name in kernel-doc

Fix a kernel-doc warning by making the kernel-doc function description
match the function name:

include/linux/scatterlist.h:323: warning: expecting prototype for sg_unmark_bus_address(). Prototype was for sg_dma_unmark_bus_address() instead

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 4239930 ("lib/scatterlist: add flag for indicating P2PDMA segments in an SGL")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Logan Gunthorpe <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: rddunlap

include/linux/scatterlist.h

@@ -313,7 +313,7 @@ static inline void sg_dma_mark_bus_address(struct scatterlist *sg)
 }
 
 /**
- * sg_unmark_bus_address - Unmark the scatterlist entry as a bus address
+ * sg_dma_unmark_bus_address - Unmark the scatterlist entry as a bus address
  * @sg:		 SG entry
  *
  * Description: