docs: small fix in solid/switch usage example (#2227)

Author: tslocke

website/data/snippets/solid/switch/usage.mdx

@@ -14,7 +14,7 @@ function Checkbox() {
       <span {...api().getControlProps()}>
         <span {...api().getThumbProps()} />
       </span>
-      <span {...api().getLabelProps()}>{api.checked ? "On" : "Off"}</span>
+      <span {...api().getLabelProps()}>{api().checked ? "On" : "Off"}</span>
     </label>
   )
 }