Fixed spelling in customized email templates area

doc/user/project/service_desk.md

@@ -99,7 +99,7 @@ navigation's **Issues** menu.
 
 When a user submits a new issue using Service Desk, or when a new note is created on a Service Desk issue, an email is sent to the author.
 
-The body of these email messages can customized by using templates. To create a new customized template,
+The body of these email messages can be customized by using templates. To create a new customized template,
 create a new Markdown (`.md`) file inside the `.gitlab/service_desk_templates/`
 directory in your repository. Commit and push to your default branch.