[PATCH] nstree: add/fix struct ns_id_req kernel-doc member fields

- drop non-existent @filter
- add missing descriptions for @ns_type and @spare2
- change the descriptions of @ns_id and @user_ns_id based on their commit

to prevent these kernel-doc warnings:

Warning: ../include/uapi/linux/nsfs.h:117 struct member 'ns_type' not
 described in 'ns_id_req'
Warning: ../include/uapi/linux/nsfs.h:117 struct member 'spare2' not
 described in 'ns_id_req'
Warning: ../include/uapi/linux/nsfs.h:117 Excess struct member 'filter'
 description in 'ns_id_req'

Fixes: 76b6f5dfb3fd ("nstree: add listns()")
Signed-off-by: Randy Dunlap <redacted>
---
Cc: Christian Brauner <brauner@kernel.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jan Kara <jack@suse.cz>
Cc: netdev@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org

 include/uapi/linux/nsfs.h |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- linux-next-20260722.orig/include/uapi/linux/nsfs.h
+++ linux-next-20260722/include/uapi/linux/nsfs.h

@@ -96,9 +96,10 @@ enum ns_type {
  * struct ns_id_req - namespace ID request structure
  * @size: size of this structure
  * @spare: reserved for future use
- * @filter: filter mask
- * @ns_id: last namespace id
- * @user_ns_id: owning user namespace ID
+ * @ns_id: last namespace ID
+ * @ns_type: bit mask of namespace types to include
+ * @spare2: reserved for future use
+ * @user_ns_id: filter on this user namespace ID (or 0)
  *
  * Structure for passing namespace ID and miscellaneous parameters to
  * statns(2) and listns(2).