doc: fix typos in async_hooks

PR-URL: #18314
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

doc/api/async_hooks.md

@@ -244,10 +244,10 @@ RANDOMBYTESREQUEST, TLSWRAP, Timeout, Immediate, TickObject
 There is also the `PROMISE` resource type, which is used to track `Promise`
 instances and asynchronous work scheduled by them.
 
-Users are be able to define their own `type` when using the public embedder API.
+Users are able to define their own `type` when using the public embedder API.
 
 *Note:* It is possible to have type name collisions. Embedders are encouraged
-to use a unique prefixes, such as the npm package name, to prevent collisions
+to use unique prefixes, such as the npm package name, to prevent collisions
 when listening to the hooks.
 
 ###### `triggerId`