changed "a executable" to "an executable" (#119)

Author: Motifs Media

Diff for: extending-the-rest-api/routes-and-endpoints.md

@@ -479,7 +479,7 @@ add_action( 'rest_api_init', 'prefix_register_example_routes' );
 
 #### Sanitizing
 
-In the above example, we do not need to use a `sanitize_callback`, because we are restricting input to only values in our enum. If we did not have strict validation and accepted any string as a parameter, we would definitely need to register a `sanitize_callback`. What if we wanted to update a content field and the user entered something like `alert('ZOMG Hacking you');`. The field value could potentially be a executable script. To strip out unwanted data or to transform data into a desired format we need to register a `sanitize_callback` for our arguments. Here is an example of how to use WordPress's `sanitize_text_field()` for a sanitize callback:
+In the above example, we do not need to use a `sanitize_callback`, because we are restricting input to only values in our enum. If we did not have strict validation and accepted any string as a parameter, we would definitely need to register a `sanitize_callback`. What if we wanted to update a content field and the user entered something like `alert('ZOMG Hacking you');`. The field value could potentially be an executable script. To strip out unwanted data or to transform data into a desired format we need to register a `sanitize_callback` for our arguments. Here is an example of how to use WordPress's `sanitize_text_field()` for a sanitize callback:
 
 ```php
 /**