Update index.md

doc/api/index.md

@@ -214,7 +214,7 @@ Impersonation tokens are a type of [personal access token](../user/profile/perso
 They can be created only by an administrator, and are used to authenticate with the
 API as a specific user.
 
-Use impersonation tokens an alternative to:
+Use impersonation tokens as an alternative to:
 
 - The user's password or one of their personal access tokens.
 - The [Sudo](#sudo) feature. The user's or administrator's password or token
@@ -283,7 +283,7 @@ message with a status code of `403`:
 ```
 
 If an access token without the `sudo` scope is provided, an error message is
-be returned with a status code of `403`:
+returned with a status code of `403`:
 
 ```json
 {