crypto: sig - fix kernel-doc typo

Correct typo of "destination".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/crypto/sig.h

@@ -79,7 +79,7 @@ int crypto_sig_maxsize(struct crypto_sig *tfm);
  * @tfm:	signature tfm handle allocated with crypto_alloc_sig()
  * @src:	source buffer
  * @slen:	source length
- * @dst:	destinatino obuffer
+ * @dst:	destination obuffer
  * @dlen:	destination length
  *
  * Return: zero on success; error code in case of error