typo, missing "of" (#1578)

Author: tacman

core/messenger.md

@@ -165,7 +165,7 @@ As above, we use the `status` attribute to configure API Platform to return a [2
 It indicates that the request has been received and will be treated later, without giving an immediate return to the client.
 Finally, the `output` attribute is set to `false`, so the HTTP response that will be generated by API Platform will be empty, and the [serialization process](serialization.md) will be skipped.
 
-In this case, when a `POST` request is issued on `/users/reset_password` the message handler will receive an `App\Dto\ResetPasswordRequest` object instead a `User` because we specified it as `input` and set `messenger=input`:
+In this case, when a `POST` request is issued on `/users/reset_password` the message handler will receive an `App\Dto\ResetPasswordRequest` object instead of a `User` because we specified it as `input` and set `messenger=input`:
 
 ```php
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