docs: fix store initialisation syntax in usage with other libraries

docs/src/content/docs/guides/using-with-other-libraries.mdx

@@ -29,7 +29,7 @@ First, let's create a store with an initial state.
 ```ts
 import { Store } from "@genshi/core";
 
-const [store, useStore] = new Store({
+const store = new Store({
   count: 0,
 });
 ```