LU-9633 llite: Add kernel doc style for lustre/llite/*.c (Part 7)

LU-9633 llite: Add kernel doc style for lustre/llite/*.c (Part 7)

This patch converts existing functional comments
to kernel doc style comments and removes '/**' for
comments which is not meant to be a kernel-doc comment

./kernel-doc -v -none lustre/llite/symlink.c lustre/llite/rw26.c
llite/symlink.c:244: info: Scanning doc for function ll_getattr_link
llite/rw26.c:36: info: Scanning doc for function ll_invalidate_folio
llite/rw26.c:92: info: Scanning doc for function ll_invalidatepage
llite/rw26.c:719: info: Scanning doc for function ll_prepare_partial_page

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I9c9fd4c5c1edc426df42165c11c54fdd694bf722
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58279
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Anjus George <georgea@ornl.gov>
Reviewed-by: Oleg Drokin <green@whamcloud.com>