netfilter: fix typo in nf_conntrack_l4proto.h comment

In the comment for nf_conntrack_l4proto.h, the word "nfnetink" was
incorrectly spelled. It has been corrected to "nfnetlink".

Fixes a typo to enhance readability and ensure consistency.

Signed-off-by: caivive (Weibiao Tu) <[e-mail]>
Signed-off-by: Florian Westphal <[e-mail]>

include/net/netfilter/nf_conntrack_l4proto.h

···
 	/* called by gc worker if table is full */
 	bool (*can_early_drop)(const struct nf_conn *ct);
 
-	/* convert protoinfo to nfnetink attributes */
+	/* convert protoinfo to nfnetlink attributes */
 	int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
 			 struct nf_conn *ct, bool destroy);