docs: add missing comma (#4295)

Summary:
## Description

Added a missing comma in an example in the docs

Pull Request resolved: #4295

Reviewed By: voideanvalue

Differential Revision:
D45660869

Privacy Context Container: L1125407

Pulled By: captbaritone

fbshipit-source-id: 46c31075adeb791547dca35b928210e8ff97543f

website/docs/guided-tour/refetching/refetching-queries-with-different-data.md

@@ -147,7 +147,7 @@ function App(props: Props) {
           // be cached, so we use the 'store-only'
           // fetchPolicy to avoid suspending.
           loadQuery({id: 'different-id'}, {fetchPolicy: 'store-only'});
-        }
+        },
         error: () => {
           setIsRefetching(false);
         }