docs(svelte-query): call 'useIsMutating' a function instead of a hook (#11559)

Author: sukvvon

docs/framework/svelte/reference/functions/useIsMutating.md

@@ -9,7 +9,7 @@ function useIsMutating(filters?: MutationFilters<unknown, Error, unknown, unknow
 
 Defined in: [packages/svelte-query/src/useIsMutating.svelte.ts:28](https://github.com/TanStack/query/blob/main/packages/svelte-query/src/useIsMutating.svelte.ts#L28)
 
-`useIsMutating` is an optional hook that returns the `number` of mutations that your application is
+`useIsMutating` is an optional function that returns the `number` of mutations that your application is
 running (useful for app-wide loading indicators).
 
 ## Parameters

packages/svelte-query/src/useIsMutating.svelte.ts

@@ -3,7 +3,7 @@ import { ReactiveValue } from './containers.svelte.js'
 import type { MutationFilters, QueryClient } from '@tanstack/query-core'
 
 /**
- * `useIsMutating` is an optional hook that returns the `number` of mutations that your application is
+ * `useIsMutating` is an optional function that returns the `number` of mutations that your application is
  * running (useful for app-wide loading indicators).
  *
  * @param filters - {@link MutationFilters} to narrow down which mutations to count.