improve transaction processing (#741)

Co-authored-by: Aliaksandr Bahdanau <a.bahdanau@pixelplex.io>

docs/develop/dapps/asset-processing/README.md

@@ -178,6 +178,10 @@ main();
 7. Service should regularly poll the [getTransactions](https://toncenter.com/api/v2/#/transactions/get_transactions_getTransactions_get) method for the `wallet` contract. Matching confirmed transactions with the outgoing payments by (`destination_address`, `value`, `comment`) allows to mark payments as finished; detect and show the user the corresponding transaction hash and lt (logical time).
 8. Requests to `v3` of `high-load` wallets have an expiration time equal to 60 seconds by default. After that time unprocessed requests can be safely resent to the network (see steps 3-6).
 
+:::caution
+If `value` attached is too small transaction can get aborted with error `cskip_no_gas`. In this case Toncoins will be transferred successfully but no logic on other side will be executed (TVM won't even launch). About gas limits you can read more [here](/develop/howto/blockchain-configs#param-20-and-21). 
+:::
+
 ### Get transaction id
 
 It can be unclear that to get more information on transaction user must scan blockchain through [getTransactions](https://toncenter.com/api/v2/#/transactions/get_transactions_getTransactions_get) function.

docs/develop/dapps/asset-processing/jettons.md

@@ -238,6 +238,8 @@ To send **comment** you need setup `forward payload`. Set **first 32 bits to 0x0
 
 Finally, to retrieve `Excess` message you must set up `response destination`.
 
+Sometimes you may encounter a `709` error when sending jetton. It says that the value of the toncoin attached to the message is not enough to send it. Make sure that `Toncoin > to_nano(TRANSFER_CONSUMPTION) + forward_ton_amount`. `TRANSFER_CONSUMPTION` in most cases may be 0.037 if the `forward_payload` is not too large. Also don't forget to attach enough `forward_ton_amount` or you can encounter a `cskip_no_gas` error if attached value too small.
+
 
 :::tip
 Check [best practices](/develop/dapps/asset-processing/jettons#best-practices) for _"send jettons with comments"_ example.
@@ -1199,4 +1201,4 @@ You can find a list of SDKs for various languages (js, python, golang, C#, Rust,
 
 * [Payments Processing](/develop/dapps/asset-processing/)
 * [NFT processing on TON](/develop/dapps/asset-processing/nfts)
-* [Metadata parsing on TON](/develop/dapps/asset-processing/metadata)
+* [Metadata parsing on TON](/develop/dapps/asset-processing/metadata)