Update produce.mdx: Clarify meaning of "local mutation" (#1120)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
Co-authored-by: Sarah <[email protected]>

Author: 3 people

src/routes/reference/store-utilities/produce.mdx

@@ -2,7 +2,7 @@
 title: produce
 ---
 
-`produce` is an [Immer](https://immerjs.github.io/immer/) inspired API for Solid's Store objects that allows for localized mutation.
+`produce` is an [Immer](https://immerjs.github.io/immer/) inspired API for Solid's Store objects that allows the store to be mutated inside the `produce` function.
 
 ```ts
 import { produce } from "solid-js/store"