Fix link to ABCI in SDK Application Architecture (cosmos#3167)

docs/intro/sdk-app-architecture.md

@@ -6,7 +6,7 @@ A blockchain application is just a [replicated deterministic state machine](http
 
 >Tendermint is an application-agnostic engine that is responsible for handling the *networking* and *consensus* layers of your blockchain. In practice, this means that Tendermint is reponsible for propagating and ordering transaction bytes. Tendermint Core relies on an eponymous Byzantine-Fault-Tolerant (BFT) algorithm to reach consensus on the order of transactions. For more on Tendermint, click [here](https://tendermint.com/docs/introduction/introduction.html).
 
-Tendermint passes transactions from the network to the application through an interface called the [ABCI](https://github.com/tendermint/tendermint/tree/master/abci. If you look at the architecture of the blockchain node you are building, it looks like the following:
+Tendermint passes transactions from the network to the application through an interface called the [ABCI](https://github.com/tendermint/tendermint/tree/master/abci). If you look at the architecture of the blockchain node you are building, it looks like the following:
 
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