Update useSubscription options documentation

docs/shared/subscription-options.mdx

@@ -5,4 +5,5 @@
 | `shouldResubscribe` | boolean | Determines if your subscription should be unsubscribed and subscribed again |
 | `onSubscriptionData` | (options: OnSubscriptionDataOptions<TData>) => any | Allows the registration of a callback function, that will be triggered each time the `useSubscription` Hook / `Subscription` component receives data. The callback `options` object param consists of the current Apollo Client instance in `client`, and the received subscription data in `subscriptionData`. |
 | `fetchPolicy` | FetchPolicy | How you want your component to interact with the Apollo cache. For details, see [Setting a fetch policy](https://www.apollographql.com/docs/react/data/queries/#setting-a-fetch-policy). |
+| `context` | Record<string, any> | Shared context between your component and your network interface (Apollo Link). |
 | `client` | ApolloClient | An `ApolloClient` instance. By default `useSubscription` / `Subscription` uses the client passed down via context, but a different client can be passed in. |