message: docs: use the correct word
diff: @@ -13,7 +13,7 @@ export interface RetryConfig {
  count?: number;
  /**
  * The number of milliseconds to delay before retrying, OR a function to
  - * return a notifier for delaying. If a function is returned, that function should
  + * return a notifier for delaying. If a function is given, that function should
  * return a notifier that, when it emits will retry the source. If the notifier
  * completes _without_ emitting, the resulting observable will complete without error,
  * if the notifier errors, the error will be pushed to the result.
  