Minor typo fix

Noticed this in the docs.

lib/race.js

@@ -4,7 +4,7 @@ import once from './internal/once';
 
 /**
  * Runs the `tasks` array of functions in parallel, without waiting until the
- * previous function has completed. Once any the `tasks` completed or pass an
+ * previous function has completed. Once any of the `tasks` completed or pass an
  * error to its callback, the main `callback` is immediately called. It's
  * equivalent to `Promise.race()`.
  *