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docs: Fix dead link in 02-sdk-app-architecture.md (#24679)

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Co-authored-by: Alex | Interchain Labs <alex@interchainlabs.io>
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docs/docs/learn/intro/02-sdk-app-architecture.md
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@ -84,7 +84,7 @@ Note that **CometBFT only handles transaction bytes**. It has no knowledge of wh
Here are the most important messages of the ABCI:
* `CheckTx`: When a transaction is received by CometBFT, it is passed to the application to check if a few basic requirements are met. `CheckTx` is used to protect the mempool of full-nodes against spam transactions. . A special handler called the [`AnteHandler`](../beginner/04-gas-fees.md#antehandler) is used to execute a series of validation steps such as checking for sufficient fees and validating the signatures. If the checks are valid, the transaction is added to the [mempool](https://docs.cometbft.com/v0.37/spec/p2p/messages/mempool) and relayed to peer nodes. Note that transactions are not processed (i.e. no modification of the state occurs) with `CheckTx` since they have not been included in a block yet.
* `CheckTx`: When a transaction is received by CometBFT, it is passed to the application to check if a few basic requirements are met. `CheckTx` is used to protect the mempool of full-nodes against spam transactions. . A special handler called the [`AnteHandler`](../beginner/04-gas-fees.md#antehandler) is used to execute a series of validation steps such as checking for sufficient fees and validating the signatures. If the checks are valid, the transaction is added to the [mempool](https://docs.cometbft.com/v0.37/spec/p2p/legacy-docs/messages/mempool) and relayed to peer nodes. Note that transactions are not processed (i.e. no modification of the state occurs) with `CheckTx` since they have not been included in a block yet.
* `DeliverTx`: When a [valid block](https://docs.cometbft.com/v0.37/spec/core/data_structures#block) is received by CometBFT, each transaction in the block is passed to the application via `DeliverTx` in order to be processed. It is during this stage that the state transitions occur. The `AnteHandler` executes again, along with the actual [`Msg` service](../../build/building-modules/03-msg-services.md) RPC for each message in the transaction.
* `BeginBlock`/`EndBlock`: These messages are executed at the beginning and the end of each block, whether the block contains transactions or not. It is useful to trigger automatic execution of logic. Proceed with caution though, as computationally expensive loops could slow down your blockchain, or even freeze it if the loop is infinite.