ppp: Fix spelling typo in comment in ppp_async_encode()

Fix spelling typo in comment
Reported-by: k2ci <kernel-bot@kylinos.cn>
Signed-off-by: liyouhong <liyouhong@kylinos.cn>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231227015831.289077-1-liyouhong@kylinos.cnSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ppp/ppp_async.c

@@ -533,7 +533,7 @@ ppp_async_encode(struct asyncppp *ap)
 	proto = get_unaligned_be16(data);
 
 	/*
-	 * LCP packets with code values between 1 (configure-reqest)
+	 * LCP packets with code values between 1 (configure-request)
 	 * and 7 (code-reject) must be sent as though no options
 	 * had been negotiated.
 	 */