net: flow_dissector: fix typo 'can by' to 'can be'

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/flow_dissector.h

@@ -251,7 +251,7 @@ extern struct flow_dissector flow_keys_buf_dissector;
  * This structure is used to hold a digest of the full flow keys. This is a
  * larger "hash" of a flow to allow definitively matching specific flows where
  * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
- * that it can by used in CB of skb (see sch_choke for an example).
+ * that it can be used in CB of skb (see sch_choke for an example).
  */
 #define FLOW_KEYS_DIGEST_LEN	16
 struct flow_keys_digest {