Fix Error Handling Example in Conditional Rendering Documentation (#750)

Author: hussain-t

src/routes/concepts/control-flow/conditional-rendering.mdx

@@ -43,7 +43,7 @@ import { Show } from "solid-js"
 
 <Show when={data.loading}>
   <div>Loading...</div>
-  <Show when={!data.error}>
+  <Show when={data.error}>
     <div>Error: {data.error}</div>
   </Show>
 </Show>
@@ -85,4 +85,4 @@ import { Switch, Match } from "solid-js"
 		<p>Outcome 2</p>
 	</Match>
 </Switch>
-```
+```