audit: Update kdoc for audit_send_reply and audit_list_rules_send

The kbuild test robot reported:
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-next
> head:   6f285b19d09f72e801525f5eea1bdad22e559bf0
> commit: 6f285b19d09f72e801525f5eea1bdad22e559bf0 [2/2] audit: Send replies in the proper network namespace.
> reproduce: make htmldocs
>
> >> Warning(kernel/audit.c:575): No description found for parameter 'request_skb'
> >> Warning(kernel/audit.c:575): Excess function parameter 'portid' description in 'audit_send_reply'
> >> Warning(kernel/auditfilter.c:1074): No description found for parameter 'request_skb'
> >> Warning(kernel/auditfilter.c:1074): Excess function parameter 'portid' description in 'audit_list_rules_s

Which was caused by my failure to update the kdoc annotations when I
updated the functions.  Fix that small oversight now.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index e8d1c7c..92062fd 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1067,7 +1067,7 @@
 
 /**
  * audit_list_rules_send - list the audit rules
- * @portid: target portid for netlink audit messages
+ * @request_skb: skb of request we are replying to (used to target the reply)
  * @seq: netlink audit message sequence (serial) number
  */
 int audit_list_rules_send(struct sk_buff *request_skb, int seq)