scatterlist: add missing function params to kernel-doc

Describe missing function parameters to prevent kernel-doc warnings:

lib/scatterlist.c:288: warning: Function parameter or member 'first_chunk' not described in '__sg_alloc_table'
lib/scatterlist.c:800: warning: Function parameter or member 'flags' not described in 'sg_miter_start'

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Randy Dunlap <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

lib/scatterlist.c

···
  * @table:	The sg table header to use
  * @nents:	Number of entries in sg list
  * @max_ents:	The maximum number of entries the allocator returns per call
- * @nents_first_chunk: Number of entries int the (preallocated) first
+ * @first_chunk: first SGL if preallocated (may be %NULL)
+ * @nents_first_chunk: Number of entries in the (preallocated) first
  * 	scatterlist chunk, 0 means no such preallocated chunk provided by user
  * @gfp_mask:	GFP allocation mask
  * @alloc_fn:	Allocator to use
···
  * @miter: sg mapping iter to be started
  * @sgl: sg list to iterate over
  * @nents: number of sg entries
+ * @flags: sg iterator flags
  *
  * Description:
  *   Starts mapping iterator @miter.