net: skbuff: fix kernel-doc typos

Correct punctuation and drop an extraneous word.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231008214121.25940-1-rdunlap@infradead.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: rddunlap

include/linux/skbuff.h

@@ -1309,7 +1309,7 @@ struct sk_buff_fclones {
  *
  * Returns true if skb is a fast clone, and its clone is not freed.
  * Some drivers call skb_orphan() in their ndo_start_xmit(),
- * so we also check that this didnt happen.
+ * so we also check that didn't happen.
  */
 static inline bool skb_fclone_busy(const struct sock *sk,
 				   const struct sk_buff *skb)
@@ -2016,7 +2016,7 @@ static inline struct sk_buff *skb_share_check(struct sk_buff *skb, gfp_t pri)
  *	Copy shared buffers into a new sk_buff. We effectively do COW on
  *	packets to handle cases where we have a local reader and forward
  *	and a couple of other messy ones. The normal one is tcpdumping
- *	a packet thats being forwarded.
+ *	a packet that's being forwarded.
  */
 
 /**