LU-8861 doc: Update llapi_ladvise man page

LU-8861 doc: Update llapi_ladvise man page

Correct the input parameters for the llapi_ladvise routine
in the llapi_ladvise man page. The struct llapi_ladvise
expects is llapi_lu_ladvise.

Test-Parameters: trivial
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: I30d55813a02a1d2d8f23db44b1f118f2cf7b6803
Reviewed-on: http://review.whamcloud.com/23901
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>