fixing dead links from sdk default branch update (cosmos#1301)

Author: damiannolan

docs/apps/interchain-accounts/transactions.md

@@ -16,6 +16,6 @@ Transactions are executed via the ICS27 [`SendTx` API](./auth-modules.md#trysend
 
 ## Atomicity
 
-As the Interchain Accounts module supports the execution of multiple transactions using the Cosmos SDK `Msg` interface, it provides the same atomicity guarantees as Cosmos SDK-based applications, leveraging the [`CacheMultiStore`](https://docs.cosmos.network/master/core/store.html#cachemultistore) architecture provided by the [`Context`](https://docs.cosmos.network/master/core/context.html) type. 
+As the Interchain Accounts module supports the execution of multiple transactions using the Cosmos SDK `Msg` interface, it provides the same atomicity guarantees as Cosmos SDK-based applications, leveraging the [`CacheMultiStore`](https://docs.cosmos.network/main/core/store.html#cachemultistore) architecture provided by the [`Context`](https://docs.cosmos.network/main/core/context.html) type. 
 
 This provides atomic execution of transactions when using Interchain Accounts, where state changes are only committed if all `Msg`s succeed.