Mattermost-server: Document sql store 'SqlTeamStore' methods (Task 9)

[mattermod]

We want to improve our internal API documentation using godoc to ease the
development process for everybody.

This Help Wanted issue is to add the documentation to the following methods
(file: (https://github.com/mattermost/mattermost-server/tree/master/store/sqlstore/team*store.go)):

• SqlTeamStore.UpdateLastTeamIconUpdate
• SqlTeamStore.UpdateMembersRole
• SqlTeamStore.UserBelongsToTeams
• SqlTeamStore.GetTeamMembersForExport

An example of already migrated methods can be found here:

• https://github.com/mattermost/mattermost-server/pull/13896

---

If you're interested please comment here and come join our "Contributors" community channel on our daily build server, where you can discuss questions with community members and the Mattermost core team. For technical advice or questions, please join our "Developers" community channel.

New contributors please see our Developer's Guide.

JIRA: https://mattermost.atlassian.net/browse/MM-23004

[fireynis]

I am looking into getting into this project and this seems like a good way to poke around, could I claim this issue to do it?