docs: readme (#834)

Author: JandersonConstantino

README.md

@@ -340,7 +340,7 @@ Thrown on failed validations, with the following properties
 - `errors`: array of error messages
 - `inner`: in the case of aggregate errors, inner is an array of `ValidationErrors` throw earlier in the
   validation chain. When the `abortEarly` option is `false` this is where you can inspect each error thrown,
-  alternatively `errors` will have all the of the messages from each inner error.
+  alternatively, `errors` will have all of the messages from each inner error.
 
 ### mixed