docs: fix missing 's

docs/learn/advanced/04-store.md

@@ -16,7 +16,7 @@ A store is a data structure that holds the state of the application.
 
 ## Introduction to Cosmos SDK Stores
 
-The Cosmos SDK comes with a large set of stores to persist the state of applications. By default, the main store of Cosmos SDK applications is a `multistore`, i.e. a store of stores. Developers can add any number of key-value stores to the multistore, depending on their application needs. The multistore exists to support the modularity of the Cosmos SDK, as it lets each module declare and manage their own subset of the state. Key-value stores in the multistore can only be accessed with a specific capability `key`, which is typically held in the [`keeper`](../../build/building-modules/06-keeper.md) of the module that declared the store.
+The Cosmos SDK comes with a large set of stores to persist the state of applications. By default, the main store of Cosmos SDK applications is a `multistore`, i.e. a store of stores. Developers can add any number of key-value stores to the multistore, depending on their application's needs. The multistore exists to support the modularity of the Cosmos SDK, as it lets each module declare and manage their own subset of the state. Key-value stores in the multistore can only be accessed with a specific capability `key`, which is typically held in the [`keeper`](../../build/building-modules/06-keeper.md) of the module that declared the store.
 
 ```mermaid
 flowchart TB