message: fix: small typo subscription docs qgl -> gql
  Found a little typo that confused for a second when I copy pasted the code :smile:
diff: @@ -182,7 +182,7 @@ In the following example, we create a subscription that informs us of new messag
  const messages = subscriptionStore({
  client: getContextClient(),
  - query: qgl`
  + query: gql`
  subscription MessageSub {
  newMessages {
  id
  