Have you ever made a spelling mistake when you named a Teams channel? Have you then tried to rename the Channel? If so you will notice that the underlying SharePoint folder is still named incorrectly.
Figure: Unwanted name on channel
There is a workaround to rename the folder correctly.
Figure: Renaming the channel
Note: This hasn't changed the name of the folder in SharePoint!

Figure: Delete the channel
Figure: Renaming the folder in SharePoint
Note: Make sure that you rename the folder exactly the same as you named the channel.

Figure: Manage the Team
Figure: Restore the channel