Help Wanted: Apps - Document how to check if a user has permissions to manage a channel

[mm-cloud-bot]

Mattermost user michael.kochell from https://community.mattermost.com has requested the following be documented:

In order to check if a user has permission to manage a channel, you can use this logic:

- Expand `acting_user`, `channel_member`, and `team_member`
- Use `acting_user.roles.includes('system_admin') || team_member.roles.includes('team_admin') || channel_member.roles.includes('channel_admin')`

See the original post here.

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