Fix typo in email comment: hone -> one

app/views/layouts/notify.html.haml

@@ -42,7 +42,7 @@
           - else
             #{link_to "View it on GitLab", @target_url}.
           %br
-          -# Don't link the host is the line below, hone link in the email is easier to quickly click than two.
+          -# Don't link the host is the line below, one link in the email is easier to quickly click than two.
           You're receiving this email because of your account on #{Gitlab.config.gitlab.host}.
           If you'd like to receive fewer emails, you can adjust your notification settings.