docs: Throw error or mutation doesn't see any the 500 coming from API (#7754)

* Throw error or mutation doesn't see any the 500 coming from API

* fix: prettier

* ci: apply automated fixes

---------

Co-authored-by: Dominik Dorfmeister <office@dorfmeister.cc>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: 3 people

examples/react/optimistic-updates-ui/src/pages/index.tsx

@@ -39,6 +39,9 @@ function Example() {
         body: JSON.stringify({ text: newTodo }),
         headers: { 'Content-Type': 'application/json' },
       })
+      if (!response.ok) {
+        throw new Error('Something went wrong.')
+      }
       return await response.json()
     },
     onSettled: () => queryClient.invalidateQueries({ queryKey: ['todos'] }),