textsearch: describe @list member in ts_ops search

Sphinx reports kernel-doc warning:

WARNING: ./include/linux/textsearch.h:49 struct member 'list' not described in 'ts_ops'

Describe @list member to fix it.

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 2de4ff7bd658 ("[LIB]: Textsearch infrastructure.")
Signed-off-by: Bagas Sanjaya <[e-mail]>
Cc: Thomas Graf <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

include/linux/textsearch.h

···
  * @get_pattern: return head of pattern
  * @get_pattern_len: return length of pattern
  * @owner: module reference to algorithm
+ * @list: list to search
  */
 struct ts_ops
 {