docs(core): fix readme example again again

Author: mcous

packages/svelte-core/README.md

@@ -101,7 +101,7 @@ const { baseElement, container, component, rerender, unmount } = render(
 Validate options and prepare document elements for rendering.
 
 ```ts
-const { baseElement, target, mountOptions } = setup(options, renderOptions)
+const { baseElement, container, mountOptions } = setup(options, renderOptions)
 ```
 
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