docs(optimistic-updates): ease wording in introduction (#2908)

docs/src/pages/guides/optimistic-updates.md

@@ -3,7 +3,7 @@ id: optimistic-updates
 title: Optimistic Updates
 ---
 
-When you optimistically update your state before performing a mutation, there is a non-zero chance that the mutation will fail. In most cases, you can just trigger a refetch for your optimistic queries to revert them to their true server state. In some circumstances though, refetching may not work correctly and the mutation error could represent some type of server issue that won't make it possible to refetch. In this event, you can instead choose to rollback your update.
+When you optimistically update your state before performing a mutation, there is a chance that the mutation will fail. In most of these failure cases, you can just trigger a refetch for your optimistic queries to revert them to their true server state. In some circumstances though, refetching may not work correctly and the mutation error could represent some type of server issue that won't make it possible to refetch. In this event, you can instead choose to rollback your update.
 
 To do this, `useMutation`'s `onMutate` handler option allows you to return a value that will later be passed to both `onError` and `onSettled` handlers as the last argument. In most cases, it is most useful to pass a rollback function.