Added a note to update username on team page

If the login handler has been changed (due to requesting the access
to chatop, for example), this has to be reflected on the team page
so that bots (like DangerBot, for example) could still find the
user when needed

doc/development/chatops_on_gitlabcom.md

@@ -16,6 +16,8 @@ To request access to Chatops on GitLab.com:
 1. Log into <https://ops.gitlab.net/users/sign_in> **using the same username** as for GitLab.com (you may have to rename it).
 1. Ask in the [#production](https://gitlab.slack.com/messages/production) channel to add you by running `/chatops run member add <username> gitlab-com/chatops --ops`.
 
+NOTE: **Note:** If you had to change your username for GitLab.com on the first step, make sure [to reflect this information](https://gitlab.com/gitlab-com/www-gitlab-com#adding-yourself-to-the-team-page) on [the team page](https://about.gitlab.com/team).
+
 ## See also
 
 - [Chatops Usage](../ci/chatops/README.md)